AFFYMETRIX INC
10-Q, 1996-08-14
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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<PAGE>


                                    UNITED STATES
                          SECURITIES AND EXCHANGE COMMISSION
                                WASHINGTON, D.C. 20549

                          ----------------------------------

                                      FORM 10-Q



    X     Quarterly Report Pursuant to Section 13 or 15(d) of the Securities
  -----   Exchange Act of 1934 for the period ended JUNE 30, 1996

                                          or

          Transition Report Pursuant to Section 13 or 15(d) of the Securities
  -----   Exchange Act of 1934 for the transition period from ____ to  ____. 


                             Commission File No.  0-28218
                                           

                                   AFFYMETRIX, INC.
                (Exact name of Registrant as specified in its charter)
                                           

            CALIFORNIA                                        77-0319159
    (State or other jurisdiction of                      (I.R.S. Employer
    incorporation or organization)                       Identification Number)


    3380 CENTRAL EXPRESSWAY, SANTA CLARA, CALIFORNIA          95051
    (Address of principal executive offices)                (Zip Code)

          Registrant's telephone number, including area code:  (408)522-6000

    Indicate by check mark whether the registrant (1) has filed all reports 
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 
1934 during the preceding 12 months (or for such shorter period that the 
registrant was required to file such reports), and (2) has been subject to 
such filing requirements for the past 90 days.

                                   Yes   X    No      
                                       -----     -----

                COMMON SHARES OUTSTANDING ON JULY 15, 1996: 22,414,635
                                                           ------------

                                                                   Page 1 of 59

<PAGE>

                                   AFFYMETRIX, INC.
                                  TABLE OF CONTENTS


PART I.   FINANCIAL INFORMATION         


Item 1.  Financial Statements                                              Page
                                                                           ----

    Condensed Balance Sheets at June 30, 1996 and December 31, 1995.....      3

    Condensed Statements of Operations for the Three and Six Months
          Ended June 30, 1996 and 1995..................................      4

    Condensed Statements of Cash Flows for the Six Months Ended June
          30, 1996 and 1995.............................................      5

    Notes to Condensed Financial Statements.............................      6


Item 2.  Management's Discussion and Analysis of Results of Operations 
         and Financial Condition........................................      9


PART II. OTHER INFORMATION

Item 4.  Submission of Matters to a Vote of Security Holders............     26

Item 6.  Exhibits and Reports on Form 8-K...............................     27


SIGNATURES..............................................................     28


EXHIBIT INDEX...........................................................     29

                                                                   Page 2 of 59

<PAGE>


PART I.   FINANCIAL INFORMATION
ITEM 1.   FINANCIAL STATEMENTS

                              AFFYMETRIX, INC.
                         CONDENSED BALANCE SHEETS
                          (Dollars in thousands)

<TABLE>
<CAPTION>


                                                         June 30,        December 31,
                                                           1996              1995
                                                       -----------      ------------
<C>                                                    <C>              <C>
ASSETS                                                  (unaudited)         (Note)
Current assets:
    Cash and cash equivalents                            $   21,309        $    2,481
    Short-term investments                                   92,533            36,402
    Accounts receivable                                       1,265             1,342
    Inventories                                               1,550               670
    Other current assets                                        652               260
                                                        -----------      ------------
         Total current assets                               117,309            41,155
Net property and equipment                                    3,852             3,257
Other assets                                                    140               140
                                                        -----------      ------------
                                                         $  121,301        $   44,552
                                                        -----------      ------------
                                                        -----------      ------------

LIABILITIES AND SHAREHOLDERS' EQUITY

Current liabilities:
    Accounts payable and other accrued liabilities       $    4,228        $    2,745
    Deferred revenue                                          2,018             2,340
                                                        -----------      ------------
         Total current liabilities                            6,246             5,085

Noncurrent portion of capital lease obligation                  851               948

Shareholders' equity:
    Convertible preferred stock                                   0            70,439
    Common stock                                            156,529             2,717
    Deferred compensation                                    (2,078)           (2,360)
    Accumulated deficit                                     (40,214)          (32,516)
    Other                                                       (33)              239
                                                        -----------      ------------
         Total shareholders' equity                         114,204            38,519
                                                        -----------      ------------
                                                         $  121,301        $   44,552
                                                        -----------      ------------
                                                        -----------      ------------

</TABLE>


Note:  The balance sheet at December 31, 1995 has been derived from the 
audited financial statements at that date but does not include all of the 
information and footnotes required by generally accepted accounting 
principles for complete financial statements.

                             See accompanying notes.

                                                                   Page 3 of 59

<PAGE>

                                AFFYMETRIX, INC.
                       CONDENSED STATEMENTS OF OPERATIONS
         (Dollars and shares in thousands, except per share amounts)
                                   (Unaudited)

<TABLE>
<CAPTION>


                                      Three Months Ended     Six Months Ended
                                           June 30,               June 30,
                                      ------------------     ------------------
                                        1996      1995         1996       1995
                                      -------    -------     -------    -------
<S>                                   <C>        <C>         <C>        <C>
Revenue:
    Product                           $   436    $     0     $   457    $     0
    Contract and grant                  1,863      1,212       3,258      2,066
                                      -------    -------     -------    -------
         Total revenue                  2,299      1,212       3,715      2,066

Cost and expenses:
    Cost of product revenue               606          0         707          0
    Research and development            4,234      3,103       8,310      5,421
    General and administrative          1,901        979       3,550      1,712
                                      -------    -------     -------    -------
         Total operating expenses       6,741      4,082      12,567      7,133
                                      -------    -------     -------    -------

Loss from operations                   (4,442)    (2,870)     (8,852)    (5,067)

    Interest income (expense), net        665         (9)      1,154         15
                                      -------    -------     -------    -------

Net loss                              $(3,777)   $(2,879)    $(7,698)   $(5,052)
                                      -------    -------     -------    -------
                                      -------    -------     -------    -------

Net loss per share                    $(0.58)    $(0.37)     $(1.07)    $(0.65)
                                      -------    -------     -------    -------
                                      -------    -------     -------    -------

Shares used in computing net loss
    per share                           6,564      7,811       7,188      7,811
                                      -------    -------     -------    -------
                                      -------    -------     -------    -------

</TABLE>

                                  See accompanying notes.

                                                                   Page 4 of 59

<PAGE>

                                 AFFYMETRIX, INC.
                      CONDENSED STATEMENTS OF CASH FLOWS
              Increase (decrease) in cash and cash equivalents
                              (Dollars in thousands)

<TABLE>
<CAPTION>


                                                                 Six months ended June 30,
                                                                 -------------------------
Cash flows from operating activities:                                 1996        1995
                                                                   --------     -------
<S>                                                                <C>          <C>

    Net loss                                                       $ (7,698)    $(5,052)
    Adjustments to reconcile net loss to net cash used in
         operating activities:
              Depreciation and amortization                            1,197        330
              Amortization of investment premiums, net                 (637)        103
              Loss on disposal of equipment                              62           0
    Change in operating assets and liabilities:
              Accounts receivable                                        77        (291)
              Inventories                                              (880)          0
              Other current assets                                     (392)       (143)
              Other assets                                                0         (41)
              Accounts payable and other accrued liabilities          1,553       1,063
              Deferred revenue                                         (322)         38
                                                                   --------     -------
              Net cash used in operating activities                  (7,440)     (3,993)

Cash flows from investing activities:
         Capital expenditures                                        (1,236)     (1,699)
         Proceeds from the sale of short-term investments            12,460       2,707
         Proceeds from maturities of short-term investments           2,157           0
         Purchases of short-term investments                        (70,383)     (3,511)
                                                                   --------     -------
              Net cash used in investing activities                 (57,002)     (2,503)

Cash flows from financing activities:
         Issuance of preferred/common stock                          83,362         152
         Principal payments on capital lease obligation                 (92)        (84)
                                                                   --------     -------
              Net cash provided by financing activities              83,270          68

Net increase/(decrease) in cash and cash equivalents                 18,828      (6,428)
Cash and cash equivalents at beginning of period                      2,481       6,659
                                                                   --------     -------
Cash and cash equivalents at end of period                         $ 21,309     $   231
                                                                   --------     -------
                                                                   --------     -------

</TABLE>

                             See accompanying notes.

                                                                   Page 5 of 59

<PAGE>


                                   AFFYMETRIX, INC.
                       NOTES TO CONDENSED FINANCIAL STATEMENTS
                                    JUNE 30, 1996
                                     (Unaudited)


1.  SUMMARY OF SIGNIFICANT ACCOUNTING PRINCIPLES

BASIS OF PRESENTATION

The accompanying unaudited condensed financial statements have been prepared 
in accordance with generally accepted accounting principles for interim 
financial information and with the instructions to Form 10-Q and Article 10 
of Regulation S-X. Accordingly, they do not include all of the information 
and footnotes required by generally accepted accounting principles for 
complete financial statements. In the opinion of management, all adjustments 
(consisting of normal recurring accruals) considered necessary for a fair 
presentation have been included. Operating results for the three and six 
month periods ended June 30, 1996 are not necessarily indicative of the 
results that may be expected for the year ending December 31, 1996. For 
further information, refer to the financial statements and notes thereto 
included in the Registration Statement on Form S-1 filed on April 15, 1996, 
as amended, by Affymetrix, Inc. ("Affymetrix" or the "Company").

DEVELOPMENT STAGE

Through March 31, 1996, the Company was in the development stage. In April 
1996, the Company commenced commercial sales of the GeneChip system and an 
HIV probe array for research use. Therefore, the Company is no longer 
considered to be in the development stage.

REVENUE RECOGNITION

Contract and grant revenue is recorded as earned as defined within the 
specific agreements. Payments received in advance under these arrangements 
are recorded as deferred revenue until earned. Direct costs associated with 
these contracts and grants are reported as research and development expense. 
Product revenue is recognized upon shipment. Certain reserves are also 
recorded upon product shipment.

PRO FORMA NET LOSS PER SHARE

Pro forma net loss per share information is as follows:

<TABLE>
<CAPTION>


                                          Three Months Ended             Six Months Ended
                                                 June 30,                     June 30,
                                        ----------------------        ----------------------
                                          1996           1995           1996           1995 
                                        -------        -------        -------        -------
        <S>                             <C>            <C>            <C>            <C>
        Pro forma net loss per share    $ (0.21)       $ (0.16)       $ (0.43)       $ (0.29)
                                        -------        -------        -------        -------
                                        -------        -------        -------        -------

</TABLE>

                                                                   Page 6 of 59

<PAGE>

<TABLE>
<CAPTION>


                                          Three Months Ended             Six Months Ended
                                                 June 30,                     June 30,
                                        ----------------------        ----------------------
                                          1996           1995           1996           1995 
                                        -------        -------        -------        -------
<S>                                     <C>            <C>            <C>            <C>
Shares used in computing pro forma 
    net loss per share (in thousands)    17,900         17,664         17,782         17,663
                                        -------        -------        -------        -------
                                        -------        -------        -------        -------

</TABLE>


2.  CASH, CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS

As of June 30, 1996 and December 31, 1995, debt securities held by the 
Company are classified as available-for-sale and are carried at fair value 
with unrealized gains and losses reported in shareholders' equity.

The following is a summary of available-for-sale securities as of December 
31, 1995 (in thousands):

<TABLE>
<CAPTION>

                                                   Gross       Gross      Estimated
                                                Unrealized   Unrealized     Fair
                                      Cost         Gains       Losses       Value 
                                   ----------   ----------   ----------  ----------
<S>                                <C>          <C>          <C>         <C>
U.S. Government obligations:       $   38,115    $    309       $ 27     $   38,397
                                   ----------   ----------   ----------  ----------
                                   ----------   ----------   ----------  ----------
    Amounts included in:
         cash equivalents          $    1,995    $     --       $ --     $    1,995
         short-term investments        36,120         309         27         36,402
                                   ----------   ----------   ----------  ----------

         Total securities          $   38,115    $    309       $ 27     $   38,397
                                   ----------   ----------   ----------  ----------
                                   ----------   ----------   ----------  ----------

</TABLE>


The following is a summary of available-for-sale securities as of June 30, 1996
(in thousands):

<TABLE>
<CAPTION>

                                                   Gross       Gross      Estimated
                                                Unrealized   Unrealized     Fair
                                      Cost         Gains       Losses       Value 
                                   ----------   ----------   ----------  ----------
<S>                                <C>          <C>          <C>         <C>
U.S. Government obligations:       $  101,189   $      116   $      108  $  101,197
U.S. Corporate securities:             10,114           --           --      10,114
                                   ----------   ----------   ----------  ----------

         Total securities          $  111,303   $      116   $      108  $  111,311
                                   ----------   ----------   ----------  ----------
                                   ----------   ----------   ----------  ----------

    Amounts included in:
         cash equivalents          $   18,778   $       --   $       --  $   18,778
         short-term investments        92,525          116          108      92,533
                                   ----------   ----------   ----------  ----------

         Total securities          $  111,303   $      116   $      108  $  111,311
                                   ----------   ----------   ----------  ----------
                                   ----------   ----------   ----------  ----------

</TABLE>

                                                                   Page 7 of 59


<PAGE>

The gross realized gains and gross realized losses on sales of 
available-for-sale securities were immaterial for the year ended December 31, 
1995 and six months ended June 30, 1996.

The following is a summary of the amortized cost and estimated fair value of 
available-for-sale securities at June 30, 1996, by contractual maturity (in 
thousands):

<TABLE>
<CAPTION>

                                              Amortized cost    Estimated fair value
                                              --------------    --------------------
<S>                                           <C>               <C>

Mature in one year or less                     $    51,823         $    51,837

Mature after one year through three years           59,480              59,474
                                              --------------    --------------------

    Total                                      $   111,303         $   111,311
                                              --------------    --------------------
                                              --------------    --------------------

</TABLE>


3.  INVENTORIES

Inventories consist of the following (in thousands):

<TABLE>
<CAPTION>

                                   June 30,          December 31,
                                     1996                1995 
                                   ----------        ------------
               <S>                 <C>               <C>

               Raw material        $      252          $      0
               Work in process             93                 0
               Finished goods           1,205               670
                                   ----------        ------------

                    Total          $    1,550          $    670
                                   ----------        ------------
                                   ----------        ------------

</TABLE>


4.  SHAREHOLDERS' EQUITY

The Company's initial public offering on June 6, 1996 generated net proceeds 
of approximately $83.0 million from the sale of 6.0 million shares. On July 
5, 1996, the Company's underwriters purchased 153,000 shares pursuant to the 
over-allotment option, for additional net proceeds of $2.1 million. The 
Company had 22.3 million shares outstanding at June 30, 1996.

                                                                   Page 8 of 59


<PAGE>


PART 1.  FINANCIAL INFORMATION
ITEM 2.


                         MANAGEMENT'S DISCUSSION AND ANALYSIS
                   OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS


This Management's Discussion and Analysis of Financial Condition and Results 
of Operations as of June 30, 1996 and for the three and six month periods 
ended June 30, 1996 and 1995 should be read in conjunction with the 
Management's Discussion and Analysis of Financial Condition and Results of 
Operations included in the Company's Registration Statement on Form S-1 filed 
on April 15, 1996, as amended.  

The following discussion contains forward-looking statements. Such statements 
are subject to risks and uncertainties that could cause actual results to 
differ materially from those projected, including the factors set forth below 
under "Risk Factors". These forward looking statements speak only as of the 
date hereof. The Company expressly disclaims any obligation or undertaking to 
release publicly any updates or revisions to any forward-looking statements 
contained herein to reflect any change in the Company's expectations with 
regard thereto or any change in events, conditions or circumstances on which 
any such statement are based.

OVERVIEW

Affymetrix is developing GeneChip-TM- systems and related applications and 
technologies for the acquisition, analysis and management of complex genetic 
information. The business and operations of the Company were commenced in 
1991 by Affymax N.V. ("Affymax") and were initially conducted within Affymax. 
In March 1992, the Company was incorporated as a California corporation and 
wholly-owned subsidiary of Affymax. In September 1993, the Company issued 
equity securities through a private financing of approximately $21 million 
that reduced Affymax' ownership to approximately 65%. In March 1995, Glaxo 
plc, now Glaxo Wellcome plc ("Glaxo") acquired Affymax, including its then 
majority ownership interest in Affymetrix. In August 1995, the Company issued 
equity securities through a second private financing of approximately $39 
million, reducing Affymax' percentage ownership to approximately 46%. As a 
result of the Company's initial public offering of approximately 6 million 
shares in June 1996, Glaxo indirectly owns approximately 34% of Affymetrix.

The Company has a limited operating history that, to date, has focused 
primarily on the development of its technology. Based on its GeneChip 
technology platform, the Company is developing a portfolio of products for 
academic research centers, pharmaceutical and biotechnology companies and 
reference laboratories. The Company commercially introduced its first 
product, the GeneChip system and the HIV probe array for research only, in 
April 1996. Failure of the Company to successfully develop, manufacture and 
market additional products over the next several years or to realize product 
revenues would have a material adverse effect on the Company's business, 
financial condition and results of operations.

                                                                   Page 9 of 59

<PAGE>

RESULTS OF OPERATIONS

   THREE MONTHS AND SIX MONTHS ENDED JUNE 30, 1996 AND 1995
 
Product revenue from the commercial launch of the GeneChip system and HIV 
probe array was $436,000 and $457,000 for the three and six months ended June 
30, 1996, respectively, compared to no product revenue in the three and six 
months ended June 30, 1995.  Contract and grant revenue increased to $1.9 
million for the three months ended June 30, 1996 from $1.2 million for the 
three months ended June 30, 1995. Contract and grant revenue increased 58% to 
$3.3 million for the six months ended June 30, 1996 from $2.1 million for the 
six months ended June 30, 1995. The increase was primarily due to an increase 
in funding from the National Institute of Standards and Technology's Advanced 
Technology Program grant.

Cost of product revenue was $606,000 and $707,000 for the three and six 
months ended June 30, 1996, respectively, compared to no cost of product 
revenue for the three and six months ended June 30, 1995. Negative margins 
during the current quarter reflect scale-up costs of production and certain 
reserves associated with the shipment of GeneChip systems. 

Research and development expenses increased to $4.2 million and $8.3 million 
for the three and six months ended June 30, 1996, respectively, compared to 
$3.1 million and $5.4 million for the same periods ending June 30, 1995. The 
increase in research and development expenses was attributable primarily to 
the hiring of additional research and development personnel, cost of 
instrumentation shipped to collaborative partners, and increased purchases of 
research supplies. The Company expects research and development spending to 
increase over the next several years as product development and core research 
efforts expand.

General and administrative expenses increased to $1.9 million for the three 
months ended June 30, 1996 compared to $979,000 for the three months ended 
June 30, 1995. General and administrative expenses increased to $3.6 million 
for the six months ended June 30, 1996 compared to $1.7 million for the six 
months ended June 30, 1995. The increase in general and administrative 
expenses was attributable primarily to the hiring of additional management 
personnel and the incurring of legal  and other professional fees in 
connection with the overall scale-up of the Company's operations and business 
development efforts. General and administrative expenses are expected to 
continue to increase as the Company expands sales and marketing and adds 
management and support staff. 

Net interest income was $665,000 and $1.2 million for the three and six 
months ended June 30, 1996, respectively. This compares to net interest 
expense of $9,000 for the three months ended June 30, 1995 and net interest 
income of $15,000 for the six months ended June 30, 1995. The increase in net 
interest income was primarily attributable to increased investment balances 
due to equity financings in August 1995 and June 1996.

LIQUIDITY AND CAPITAL RESOURCES

Since inception, the Company has financed its operations primarily through 
the sale of equity securities, contributions from Affymax, government grants, 
collaborative agreements, and 

                                                                  Page 10 of 59

<PAGE>

issuances of convertible debt. Through June 30, 1996, the Company has 
received net cash of $155.6 million from financing activities since 
inception, consisting principally of approximately $136.5 million from equity 
financings, $10.6 million from contributions by Affymax, $7.2 million from 
the issuance of convertible notes, and  $1.3 million in lease financing.

As of June 30, 1996, the Company's cash, cash equivalents, and short-term 
investments were $113.8 million compared to $38.9 million at December 31, 
1995. The increase is primarily attributable to the receipt of approximately 
$83.0 million in net proceeds from the Company's initial public offering in 
June 1996, offset by net cash outlays of $8.7 million related to operating 
and investing activities.

The Company expects its capital requirements to increase significantly over 
the next several years as it expands its facilities and acquires scientific 
equipment to support manufacturing and research and development efforts. The 
Company's long-term capital expenditure requirements will depend on numerous 
factors, including the progress of its research and development programs; the 
development of commercial scale manufacturing capabilities;  the ability of 
Affymetrix to maintain existing collaborative arrangements and establish and 
maintain new collaborative arrangements; the costs involved in preparing, 
filing, prosecuting, defending and enforcing intellectual property rights; 
the effectiveness of product commercialization activities and arrangements; 
and other factors.

RISK FACTORS

The following factors, among others, could affect the Company's actual future 
results, including its product sales, expenses and capital requirements, and 
could cause them to differ from any forward looking statements made by or on 
behalf of the Company.

   EARLY STAGE OF DEVELOPMENT

The Company is at an early stage of development. The Company has not 
commercialized significant quantities of products based on its technologies. 
Substantially all of the Company's revenues have been derived from payments 
from collaborative research and development agreements and government 
research grants. 

The Company's GeneChip system and other potential products will require 
significant additional development and investment, including testing to 
further validate performance and demonstrate cost effectiveness. While the 
Company's initial product sales for research use have not required regulatory 
approval, the Company expects that such approval will be required in the 
future. The Company may need to undertake costly and time-consuming efforts 
to obtain this approval. There can be no assurance that any products will be 
successfully developed, be proven to be accurate and efficacious in any 
markets, meet applicable regulatory standards in a timely manner or at all, 
be protected from competition by others, avoid infringing the proprietary 
rights of others, be manufactured in sufficient quantities or at reasonable 
costs, or be marketed successfully. 

The Company has experienced significant operating losses since inception and 
expects these losses to continue for at least the next several years. Whether 
the Company can successfully manage the 

                                                                  Page 11 of 59

<PAGE>

transition to a commercial-scale enterprise will depend upon a number of 
factors including establishing its commercial manufacturing capability, 
developing its marketing capabilities, establishing a direct sales force and 
entering into collaborative arrangements to market its products. Failure to 
make such a transition successfully would have a material adverse effect on 
the Company's business, financial condition and results of operations.

   UNCERTAINTIES RELATING TO TECHNOLOGICAL APPROACHES; NEED FOR ADDITIONAL
   RESEARCH AND DEVELOPMENT

The Company intends to develop its GeneChip system for genomics and 
diagnostics applications. The GeneChip system involves several new 
technologies, including a complex chemical synthesis process necessary to 
create DNA probe arrays. There can be no assurance that technicians will not 
experience difficulties with the system that would prevent or limit its use. 
The instrumentation and software that comprise the GeneChip system are new 
and have not been previously used in commercial applications. As the system 
is used, it is possible that previously unrecognized defects will emerge. 
Further, in order for the Company to address new applications for the 
GeneChip system, the Company may be required to reduce the size of its probe 
arrays, increase the number of features on these arrays, develop instruments 
capable of processing the information from such probe arrays, and design 
software capable of managing such information. There can be no assurance that 
the Company will be capable of validating or achieving the improvements in 
the components of the GeneChip system necessary for its successful 
commercialization. The Company's GeneChip technology will also need to 
compete against well-established techniques and enhancements to such 
techniques for analyzing genes and for diagnostics. There can be no assurance 
that the GeneChip system will replace or compete successfully against 
existing techniques and instruments. Furthermore, there can be no assurance 
that the Company's GeneChip technology will be useful in providing 
information on the function of genes or for the analysis of larger sequences 
of genes. 

The development of diagnostic and therapeutic products based on the Company's 
technologies will be subject to the risks of failure inherent in the 
development of products based on new technologies. These risks include 
possibilities that any products based on these technologies will be found to 
be ineffective, unreliable or unsafe, or otherwise fail to receive necessary 
regulatory clearances; that products will be difficult to manufacture on a 
large scale or will be uneconomical to market; that proprietary rights of 
third parties will preclude the Company or its collaborative partners from 
marketing products; or that third parties will market superior or equivalent 
products.

   UNCERTAINTY OF MARKET ACCEPTANCE

The commercial success of the Company's GeneChip system will depend upon 
market acceptance by academic research centers, pharmaceutical and 
biotechnology companies and reference laboratories. Market acceptance will 
depend on many factors, including convincing researchers that the GeneChip 
system is an attractive alternative to current technologies for the 
acquisition, analysis and management of genetic information; the receipt of 
regulatory clearances in the United States, Europe, Japan and elsewhere; the 
need for laboratories to license other technologies, such as amplification 
technologies that may be required to use the GeneChip system for certain 
applications; and the availability of new proprietary markers that may be 
important to the diagnosis, 

                                                                  Page 12 of 59

<PAGE>

monitoring and treatment of disease for incorporation on the Company's probe 
arrays. Market acceptance may be adversely affected by ethical concerns that 
may limit the use of the GeneChip system for certain diagnostic applications 
or the analysis of genetic information.

Potential customers of the GeneChip system will need to acquire the Company's 
fluidics station and probe array scanner in order to utilize the DNA probe 
arrays. The cost of this instrumentation may deter certain potential 
customers from purchasing probe arrays. The Company may be required to 
discount the price of its GeneChip system in order to place the system with 
customers. The failure of the Company to place sufficient quantities of the 
instruments for the GeneChip system would have a material adverse effect on 
its ability to sell the disposable probe arrays.

The Company expects that its customers will be concentrated in a small number 
of academic research centers, pharmaceutical and biotechnology companies and 
reference laboratories. As a result, the Company's financial performance may 
depend on large orders from a limited number of customers. There are only 
three major reference laboratories in the United States, two of which are 
associated with large pharmaceutical companies. There can be no assurance 
that the Company will be able to successfully market the GeneChip system to 
reference laboratories or that the affiliation of these laboratories with 
pharmaceutical companies will not adversely affect their decision to purchase 
GeneChip systems. The Company's dependence on sales to a few large reference 
laboratories may also strengthen the purchasing leverage of these potential 
customers, which could reduce the sales price of the GeneChip system. Also, 
the Company believes that the sales cycle for the GeneChip system will be 
lengthy due to the need to educate potential customers about its 
characteristics. The failure of the Company to gain additional customers, the 
loss of any customer or a significant reduction in the level of sales to any 
customer would have a material adverse effect on the Company's business, 
financial condition and results of operations.

   UNCERTAINTIES RELATED TO THE HIV PROBE ARRAY

The first commercial application of the Company's GeneChip system is an HIV 
probe array designed to detect mutations in HIV, the virus that causes AIDS. 
The HIV probe array provides sequence information from the reverse 
transcriptase and protease genes of HIV and the system includes a fluidics 
station, a scanner and related software. In April 1996, the Company 
introduced the HIV probe array for research purposes only. The Company has 
placed only a limited number of HIV probe arrays at customer sites to date, 
all in the United States. These systems have been in operation for only a 
limited period of time, and their accuracy and efficacy have not been fully 
demonstrated. There are other uncertainties relating to the system, including 
that the Company has no prior experience in introducing a commercial product, 
that technicians may encounter difficulties with the system that would 
prevent or limit its use, and that the Company will rely on third parties to 
manufacture and service its instruments. Furthermore, there can be no 
assurance that the accuracy of the HIV probe array in providing sequence 
information from HIV will be better than current technologies, such as 
gel-based sequencing techniques. 

As new therapies and combinations of therapies for treating HIV are employed, 
new mutations in the HIV genome may be discovered that would require the 
Company to redesign its current probe array or develop new probe arrays or 
such therapies may eliminate the need for the Company's HIV probe array 
entirely. Advanced therapies could be discovered that target other components 
of the 

                                                                  Page 13 of 59

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virus or which do not generate drug resistance. In addition, cost containment 
pressures for treating HIV patients may limit the price the Company may be 
able to charge potential customers for its HIV probe array. There can be no 
assurance that the HIV probe array will provide useful diagnostic and 
monitoring information, that it will operate without difficulties, that 
technicians will have adequate training to use the system, or that the 
Company will not experience manufacturing or marketing difficulties selling 
the HIV probe array to academic research centers, pharmaceutical and 
biotechnology companies and reference laboratories. Furthermore, there can be 
no assurance that the HIV probe array will gain regulatory approval for 
clinical use. The Company's product revenues in the near term are dependent 
upon the commercialization of the HIV probe array. There can be no assurance 
that these revenues will be realized in the near term, or at all. Failure of 
the Company to successfully commercialize the HIV probe array could have a 
material adverse effect on the Company's business, financial condition and 
results of operations, and may adversely affect the Company's ability to 
commercialize any future products it may develop.

   HISTORY OF LOSSES AND EXPECTATION OF FUTURE LOSSES

The Company has incurred operating losses in each year since its inception, 
including net losses of approximately $10.7 million during the year ended 
December 31, 1995, and, at June 30, 1996, the Company had an accumulated 
deficit of approximately $40.2 million. The Company's losses have resulted 
principally from costs incurred in research and development and from general 
and administrative costs associated with the Company's operations. These 
costs have exceeded the Company's interest income and revenues. To date, 
revenues have been generated principally from collaborative research and 
development agreements and government research grants. The Company expects to 
incur substantial additional operating losses over the next several years as 
a result of increases in its expenses for research and product development, 
manufacturing scale-up, expansion of sales and marketing and capital 
expenditures.

   PROFITABILITY UNCERTAIN

The Company has experienced substantial operating losses and has never been 
profitable. The Company's future gross margins, if any, will be dependent on, 
among other factors, the Company's ability to cost-effectively manufacture 
the GeneChip system, product mix and the degree of price discounts required 
to market its products to academic research centers, pharmaceutical and 
biotechnology companies and reference laboratories. The amount of future 
operating losses and time required by the Company to reach profitability, if 
ever, are highly uncertain. The Company's ability to generate significant 
revenues and become profitable is dependent in large part on the ability of 
the Company to enter into additional collaborative arrangements and on the 
ability of the Company and its collaborative partners to successfully 
commercialize products developed under the collaborations. In addition, 
delays in receipt of any necessary regulatory approvals by the Company or its 
collaborators, or receipt of approvals by competitors, could adversely affect 
the successful commercialization of the Company's technologies.

   FLUCTUATIONS IN OPERATING RESULTS

The Company's quarterly operating results will depend upon the volume and 
timing of orders for GeneChip systems and probe arrays received and delivered 
during the quarter, variations in 

                                                                  Page 14 of 59

<PAGE>

payments under collaborative agreements, including milestones, royalties, 
license fees, and other contract revenues, and the timing of new product 
introductions by the Company. The Company's quarterly operating results may 
also fluctuate significantly depending on other factors, including the 
introduction of new products by the Company's competitors; regulatory 
actions; market acceptance of the GeneChip system and other potential 
products; investment in new technologies; changes in manufacturing capacity; 
variations in gross margins of the Company's products; the cost, quality and 
availability of reagents and components; the mix of products sold; changes in 
government funding; and third-party reimbursement policies.

   INTENSE COMPETITION; RAPID TECHNOLOGICAL CHANGE

Competition in genomics and diagnostics is intense and expected to increase. 
Further, the technologies for discovering genes associated with significant 
diseases and approaches for commercializing those discoveries are new and 
rapidly evolving. 

Currently, the Company's principal competition comes from existing 
technologies that are used to perform many of the same functions for which 
the Company plans to market its GeneChip systems. In the diagnostic field, 
these technologies are provided by established diagnostic companies, such as 
Abbott Laboratories, Boehringer Mannheim GmbH, Hoffmann-LaRoche, Inc., 
Johnson & Johnson and SmithKline Beecham plc. These technologies include a 
variety of established assays, such as immunoassays, histochemistry, flow 
cytometry and culture, and newer DNA probe diagnostics to analyze certain 
amounts of genetic information. In the genomics field, competitive 
technologies include gel-based sequencing using instruments provided by 
companies such as the Applied Biosystems division of Perkin Elmer and 
Pharmacia Biotech AB. In order to compete against existing technologies, the 
Company will need to demonstrate to potential customers that the GeneChip 
system provides improved performance and capabilities. 

The market for diagnostic products derived from gene discovery is currently 
limited and will be highly competitive. Many companies are developing and 
marketing DNA probe tests for genetic and other diseases. Other companies are 
conducting research on new technologies for diagnostic tests based on 
advances in genetic information. Established diagnostic companies could 
provide significant competition to the Company through the development of new 
products. These companies have the strategic commitment to diagnostics, the 
financial and other resources to invest in new technologies, substantial 
intellectual property portfolios, substantial experience in new product 
development, regulatory expertise, manufacturing capabilities and the 
distribution channels to deliver products to customers. These companies also 
have an installed base of instruments in several markets, including clinical 
and reference laboratories, which are not compatible with the GeneChip 
system. In addition, these companies have formed alliances with genomics 
companies which provide them access to genetic information that may be 
incorporated into their diagnostic tests. 

In the genomics field, future competition will likely come from existing 
competitors as well as other companies seeking to develop new technologies 
for sequencing and analyzing genetic information. In addition, pharmaceutical 
and biotechnology companies, such as Genome Therapeutics Corporation, Human 
Genome Sciences, Inc., Incyte Pharmaceuticals, Inc., Millennium 
Pharmaceuticals, Inc., Myriad Genetics, Inc. and Sequana Therapeutics, Inc. 
have 

                                                                  Page 15 of 59

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significant needs for genomic information and may choose to develop or 
acquire competing technologies to meet these needs. 

Genomics and diagnostic technologies have undergone and are expected to 
continue to undergo rapid and significant change. The Company's future 
success will depend in large part on its ability to maintain a competitive 
position with respect to these technologies. Rapid technological development 
by the Company or others may result in products or technologies becoming 
obsolete. In addition, products offered by the Company would be made obsolete 
by less expensive or more effective tests based on other technologies or by 
new therapeutic or prophylactic agents that obviate the need for diagnostic 
and monitoring information. There is no assurance that the Company will be 
able to make the enhancements to its technology necessary to compete 
successfully with newly emerging technologies.

   DEPENDENCE UPON COLLABORATIVE PARTNERS

An important element of the Company's business strategy involves 
collaborations with pharmaceutical, diagnostic and biotechnology companies 
that have discovered genes and may seek to use the Company's technologies to 
discover genetic mutations or develop diagnostic and therapeutic products. 
The Company has significant collaborations with Hewlett-Packard Company 
("HP") and Genetics Institute, Inc. ("GI").

In November 1994, the Company entered into a collaborative agreement with HP 
to develop an advanced scanner for use with the GeneChip probe arrays. The HP 
scanner is currently under development and, in 1997 the Company expects that 
HP will be the sole source of its scanners. Accordingly, if the HP scanner 
does not become available on a timely basis or fails to meet its performance 
and cost specifications, it would have a material adverse effect on the 
Company's business. 

The Company has two agreements with GI, dated November 1994 and December 
1995, relating to use of GeneChip technology to measure gene expression in 
order for GI to develop new therapeutic proteins. If GI is not successful in 
using the GeneChip technology or if the Company fails to maintain a 
satisfactory relationship with GI, the Company could lose significant 
revenues and its ability to obtain additional collaborations with other 
companies would be impaired. 

The Company has received a substantial portion of its revenues since 
inception from its collaborative partners and intends to enter into 
collaborative arrangements with other companies to apply its technology, fund 
development, commercialize potential future products, and assist in obtaining 
regulatory approval. There can be no assurance that any of the Company's 
present or future collaborative partners will perform their obligations as 
expected or will devote sufficient resources to the development, clinical 
testing or marketing of the Company's potential products developed under the 
collaborations. Any parallel development by a partner of alternative 
technologies or components of the GeneChip system, preclusion of the Company 
from entering into competitive arrangements, failure to obtain timely 
regulatory approvals, premature termination of an agreement, or failure by a 
partner to devote sufficient resources to the development and 
commercialization of the Company's products could have a material adverse 
effect on the Company's business, financial condition and results of 
operations. 

                                                                  Page 16 of 59

<PAGE>

The Company's agreements with consultants and collaborators are complex. 
There may be provisions within such agreements which give rise to disputes 
regarding the rights and obligations of the parties. These and other possible 
disagreements could lead to delays in collaborative research, development or 
commercialization of certain products, or could require or result in 
litigation or arbitration, which would be time-consuming and expensive, and 
could have a material adverse effect on the Company's business, financial 
condition and results of operations. 

There can be no assurance that the Company will be able to negotiate future 
collaborative arrangements on acceptable terms, if at all, or that such 
collaborations will be successful.

   NEED FOR ADDITIONAL FUNDING; UNCERTAINTY OF ACCESS TO CAPITAL

The Company anticipates that its existing capital resources, together with 
the net proceeds from the recently completed initial public offering and 
interest earned thereon, will enable it to maintain currently planned 
operations through at least 1998. However, this expectation is based on the 
Company's current operating plan, which could change as a result of many 
factors, and the Company could require additional funding sooner than 
anticipated. In addition, the Company may choose to raise additional capital 
due to market conditions or strategic considerations even if it has 
sufficient funds for its operating plan. The Company's requirements for 
additional capital will be substantial and will depend on many factors, 
including payments received under existing and possible future collaborative 
agreements; the availability of government research grant payments; the 
progress of the Company's collaborative and independent research and 
development projects; the costs of preclinical and clinical trials for the 
Company's products; the prosecution, defense and enforcement of patent claims 
and other intellectual property rights; and development of manufacturing, 
marketing and sales capabilities. The Company has no credit facility or other 
committed sources of capital. To the extent capital resources are 
insufficient to meet future capital requirements, the Company will have to 
raise additional funds to continue the development of its technologies. There 
can be no assurance that such funds will be available on favorable terms, or 
at all. To the extent that additional capital is raised through the sale of 
equity or convertible debt securities, the issuance of such securities could 
result in dilution to the Company's shareholders. If adequate funds are not 
available, the Company may be required to curtail operations significantly or 
to obtain funds through entering into collaboration agreements on 
unattractive terms. The Company's inability to raise capital would have a 
material effect on the Company's business, financial condition and results of 
operations.

   ETHICAL, LEGAL AND SOCIAL IMPLICATIONS OF GENETIC PREDISPOSITION TESTING

The Company's success will depend in part upon the Company's ability to 
develop genetic tests for genes discovered by the Company and others. Genetic 
tests, such as certain of the Company's GeneChip tests, may be difficult to 
perform and interpret and may lead to misinformation or misdiagnosis. 
Further, even when a genetic test identifies the existence of a mutation in 
an individual, the interpretation of the result is often limited to the 
identification of a statistical probability that the tested individual will 
develop the disease or condition for which the test is performed. In 
addition, once available, such tests may be subject to ethical concerns or 
reluctance to administer or pay for tests for conditions that are not 
treatable. Further, it is possible that 

                                                                  Page 17 of 59

<PAGE>

gene-based diagnostic tests marketed by other companies could encounter 
specific difficulties, resulting in societal and governmental concerns 
regarding genetic testing. 

The prospect of broadly available genetic predisposition testing has raised 
issues regarding the appropriate utilization and the confidentiality of 
information provided by such testing. It is possible that discrimination by 
insurance companies could occur through the raising of premiums by insurers 
to prohibitive levels, outright cancellation of insurance or unwillingness to 
provide coverage to patients shown to have a genetic predisposition to a 
particular disease. In addition, employers could discriminate against 
employees with a positive genetic predisposition due to the increased risk 
for disease resulting in possible cost increases for health insurance and the 
potential for lost employment time. Finally, governmental authorities could, 
for social or other purposes, limit the use of genetic testing or prohibit 
testing for genetic predisposition to certain conditions which could 
adversely affect the use of the Company's products. There can be no assurance 
that ethical concerns about genetic testing will not materially adversely 
affect market acceptance of the Company's GeneChip system.

   LIMITED MANUFACTURING CAPABILITY; SOLE SOURCE SUPPLIERS

The Company has limited experience manufacturing products for commercial 
purposes. To date, the Company has a small scale facility providing limited 
quantities of probe arrays for internal and collaborative purposes and 
initial sales of the GeneChip system to the research market. To achieve the 
production levels of probe arrays necessary for successful commercialization 
of its products, the Company will need to scale-up its manufacturing 
facilities and establish automated manufacturing capabilities. The Company 
may also need to comply with the current good manufacturing practices ("GMP") 
prescribed by the United States Food and Drug Administration ("FDA") for sale 
of products in the United States, ISO standards for sale of products in 
Europe, as well as other standards prescribed by various federal, state and 
local regulatory agencies in the United States and other countries. Although 
the Company does not currently need to comply with GMP to manufacture probe 
arrays and related instrumentation for sale for research purposes, it may 
need to be GMP compliant to sell these products to clinical reference 
laboratories, and it will need to be compliant to sell these products for 
clinical use. There can be no assurance that manufacturing and quality 
control problems will not arise as the Company attempts to scale-up its 
manufacturing facilities or that such scale-up can be achieved in a timely 
manner or at commercially reasonable costs. 

The Company's probe array manufacturing process is complex and involves a 
number of technologies that have never before been combined in the 
manufacture of a single product. The Company tests only selected probe arrays 
from each wafer and only selected probes on each probe array. It is therefore 
possible that defective probe arrays might not be identified before they are 
shipped. The Company therefore relies on quality control procedures, 
including controls on the manufacturing process and sample testing, to verify 
the correct completion of the manufacturing process. In addition, there may 
be certain aspects of the Company's manufacturing that are not fully 
understood and cannot be readily replicated for commercial use. If the 
Company is unable to manufacture probe arrays on a timely basis because of 
these or other factors, its business, financial condition and results of 
operations could be adversely affected. 

                                                                  Page 18 of 59

<PAGE>

As the Company's technologies evolve, new manufacturing techniques and 
systems will be required. For example, it is anticipated that batch 
processing systems will be needed to meet the Company's future probe array 
manufacturing needs. Further, as products requiring increased density are 
developed, miniaturization of the features on the arrays will be necessary, 
requiring new or modified manufacturing equipment and processes. Further, the 
Company's manufacturing equipment requires significant capital investment. 
The Company will rely on a single manufacturing facility for its probe arrays 
for the foreseeable future. This manufacturing facility is subject to natural 
disasters such as earthquakes and floods. The former are of particular 
significance since the manufacturing facility is located in an earthquake 
prone area. In the event that its manufacturing facility were to be affected 
by accidental or natural disasters, the Company would be unable to 
manufacture products for sale until the facility was replaced or restored to 
operation. 

Certain key parts of the GeneChip system, such as the probe array scanner, 
the fluidics station, and certain reagents, are currently available only from 
a single source or a few sources. The Company currently obtains the scanner 
for its GeneChip probe arrays from Molecular Dynamics, Inc. ("Molecular 
Dynamics"). The Company is dependent on Molecular Dynamics for quality 
testing and service of this instrument. The Company has entered into an 
agreement with HP to supply a new scanner for the GeneChip system, which the 
Company expects to be available for commercialization in 1997. The Company's 
ability to commercialize a probe array with more features is dependent upon 
successful development of the HP scanner. The Company has contracted with 
RELA, Inc. ("RELA"), a private company, to supply the fluidics station that 
is part of the GeneChip system. The fluidics stations for the initial 
GeneChip systems were prototypes manufactured by the Company and not supplied 
by RELA. No assurance can be given that probe array scanners, fluidics 
stations or reagents will be available in commercial quantities at acceptable 
costs. If the Company is required to seek alternative sources of supply, it 
could be time consuming and expensive. In addition, the Company is dependent 
on its vendors to provide components of appropriate quality and reliability 
and to meet applicable regulatory requirements. Consequently, in the event 
that supplies from these suppliers were delayed or interrupted for any 
reason, the Company's ability to develop and supply its products could be 
impaired, which could have a material adverse effect on the Company's 
business, financial condition and results of operations. 

The GeneChip system is a complex set of instruments and includes DNA probe 
arrays, which are produced in an innovative and complicated manufacturing 
process. During the beta testing phase of the GeneChip system's development, 
the Company and its vendors have encountered and addressed a number of 
technical problems, including software failures, improper alignment of probe 
array wafers, valve and tube failures in the fluidics station, sensor wiring 
issues and scanner control problems. Due to the complexity and lack of 
operating history of these products, the Company anticipates that additional 
technical problems may occur or be discovered as more systems are placed into 
operation. If these problems cannot be readily addressed, they could cause 
delays in shipments, warranty expenses and damages to customer relationships, 
which would have a material adverse effect on the Company's business, 
financial condition and results of operations.

   LIMITED SALES AND MARKETING EXPERIENCE

The Company does not have a direct sales force and has only limited 
experience in sales and marketing. As of June 30, 1996, the Company had 
placed fourteen GeneChip systems, of which 

                                                                  Page 19 of 59

<PAGE>

only a portion had been sold. The Company has not placed any of its GeneChip 
systems outside the United States. The Company intends to market its products 
to academic research centers, pharmaceutical and biotechnology companies and 
reference laboratories. The Company intends to market diagnostic tests 
through a direct sales force to its potential customers for research use 
only. The Company intends to market the GeneChip system for genomic 
applications through collaborations with pharmaceutical and biotechnology 
companies. The Company anticipates a long sales cycle to market the GeneChip 
system to its potential customers. The Company will be required to enter into 
collaboration or distribution arrangements to commercialize its products 
outside the United States. There can be no assurance that the Company will be 
able to establish a direct sales force or to establish collaborative or 
distribution arrangements to market its products. Failure to do so would have 
a material adverse effect on the Company's business, financial condition and 
results of operations.

   UNCERTAINTIES RELATED TO GOVERNMENT FUNDING

A significant portion of the Company's products for research use are likely 
to be sold to universities, government research laboratories, private 
foundations and other institutions where funding is dependent upon grants 
from government agencies such as the National Institutes of Health ("NIH"). 
Research funding by the government, however, may be significantly reduced 
under several budget proposals being discussed by the United States Congress. 
Any such reduction may materially affect the ability of the Company's 
prospective research customers to purchase the Company's products for 
research use.

The Company has received and expects to continue to receive significant funds 
under various United States Government research and technology programs. 
While the programs are generally multi-year awards, they are subject to a 
yearly appropriations process in the United States Congress. Proposed 
legislation being debated in the United States Congress would eliminate or 
reduce the program under which the Company's Advanced Technology Program 
("ATP") grant is funded by the Department of Commerce. There can be no 
assurance that the Company will receive the entire $20.8 million of funding 
designated for it under the ATP grant, and termination of the ATP grant could 
have a material adverse effect on the Company's business, financial condition 
and results of operations. 

The Company's grants from the Departments of Commerce and Energy and the NIH 
give the government certain rights to license for its own use inventions 
resulting from funded work. There can be no assurance that the Company's 
proprietary position will not be adversely affected should the government 
exercise these rights.

   UNCERTAINTIES RELATED TO THIRD-PARTY REIMBURSEMENT

The Company's ability to successfully commercialize its products may depend 
on the Company's ability to obtain adequate levels of third-party 
reimbursement for use of certain diagnostic tests in the United States, 
Europe and other countries. Currently, availability of third-party 
reimbursement is limited and uncertain for genetic tests. 

                                                                  Page 20 of 59

<PAGE>

In the United States, the cost of medical care is funded, in substantial 
part, by government insurance programs, such as Medicare and Medicaid, and 
private and corporate health insurance plans. Third-party payors may deny 
reimbursement if they determine that a prescribed device or diagnostic test 
has not received appropriate FDA or other governmental regulatory clearances, 
is not used in accordance with cost-effective treatment methods as determined 
by the payor, or is experimental, unnecessary or inappropriate. The Company's 
ability to commercialize certain of its products successfully may depend on 
the extent to which appropriate reimbursement levels for the costs of such 
products and related treatment are obtained from government authorities, 
private health insurers and other organizations, such as health maintenance 
organizations ("HMOs"). Third-party payors are increasingly challenging the 
prices charged for medical products and services. The trend towards managed 
health care in the United States and the concurrent growth of organizations 
such as HMOs, which could control or significantly influence the purchase of 
health care services and products, as well as legislative proposals to reform 
health care or reduce government insurance programs, may all result in lower 
prices for certain of the Company's products. The cost containment measures 
that health care providers are instituting and the results of any health care 
reform could have an adverse effect on the Company's ability to sell certain 
of its products and may have a material adverse effect on the Company's 
business, financial condition and results of operations. 

   GOVERNMENT REGULATION; NO ASSURANCE OF REGULATORY APPROVAL

The Company anticipates the manufacturing, labeling, distribution and 
marketing of some or all of the Company's diagnostic products will be subject 
to regulation in the United States and in certain other countries. 

In the United States, the FDA regulates, as medical devices, most diagnostic 
tests and IN VITRO reagents that are marketed as finished test kits or 
equipment. Some clinical laboratories, however, purchase individual reagents 
intended for specific analytes, and develop and prepare their own finished 
diagnostic tests. Although the FDA has not generally exercised regulatory 
authority over these individual reagents or the finished tests prepared from 
them by the clinical laboratories. The FDA has recently proposed a rule that, 
if adopted, would regulate the reagents sold to clinical laboratories as 
medical devices. The proposed rule would also restrict sales of these 
reagents to clinical laboratories certified under Clinical Laboratory 
Improvement Amendments of 1988 as high complexity testing laboratories. The 
Company intends to market some diagnostic products as finished test kits or 
equipment and others as individual reagents; consequently, some or all of 
these products will be regulated as medical devices. 

Medical devices generally require FDA approval or clearance prior to 
marketing in the United States. The process of obtaining FDA clearances or 
approvals necessary to market medical devices can be time-consuming, 
expensive and uncertain, and there can be no assurance that any clearance or 
approval sought by the Company will be granted or that FDA review will not 
involve delays, adversely affecting the marketing and sale of the Company's 
products. Further, clearance or approval may place substantial restrictions 
on the indications for which the product may be marketed or to whom it may be 
marketed. Additionally, there can be no assurance that FDA will not request 
additional data or request that the Company conduct further clinical studies. 

                                                                  Page 21 of 59

<PAGE>

If approval or clearance is obtained, the Company will be subject to 
continuing FDA obligations. When manufacturing medical devices, the Company 
will be required to adhere to regulations setting forth current GMP, which 
require that the Company manufacture its products and maintain its records in 
a prescribed manner with respect to manufacturing, testing and quality 
control activities. In addition, among other requirements, the Company will 
be required to comply with FDA requirements for labeling and promotion of its 
medical devices. Further, if the Company wanted to make changes on a product 
after FDA clearance or approval, including changes in indications or intended 
use or other significant modifications to labeling, manufacturing or product 
design, additional clearances or approvals would be required from the FDA. 

Failure to obtain required regulatory approval or clearance or failure to 
obtain timely approval or clearance, or the imposition of stringent labeling 
or sales restrictions on the Company's products, could have a material 
adverse effect on the Company. In addition, failure to comply with applicable 
regulatory requirements could subject the Company to enforcement action, 
including product seizures, recalls, withdrawal of clearances or approvals, 
restrictions on or injunctions against marketing the Company's products, and 
civil and criminal penalties, any one or more of which could have a material 
adverse effect on the Company.

Medical device laws and regulations are also in effect in many countries 
outside the United States. These range from comprehensive device approval 
requirements for some or all of the Company's medical device products to 
requests for product data or certifications. The number and scope of these 
requirements are increasing. Failure to comply with applicable state and 
foreign medical device laws and regulations may have a material adverse 
effect on the Company's business, financial condition and results of 
operations. 

The Company is also subject to numerous environmental and safety laws and 
regulations, including those governing the use and disposal of hazardous 
materials. Any violation of, and the cost of compliance with, these 
regulations could adversely affect the Company's operations.

   DEPENDENCE ON PROPRIETARY TECHNOLOGY AND UNPREDICTABILITY OF PATENT 
PROTECTION

Affymetrix depends upon patents to protect its proprietary technologies, 
including those patents assigned to Affymetrix and those licensed to 
Affymetrix. Many of these patents and applications have been filed and/or 
issued in one or more foreign countries. Affymetrix also relies upon those 
patents, copyright protection, trade secrets, know-how, continuing 
technological innovation and licensing opportunities to develop and maintain 
its competitive position. The Company's success will depend in part on its 
ability to obtain patent protection for its products and processes, to 
preserve its copyright and trade secrets and to operate without infringing 
the proprietary rights of third parties. 

The Company is party to various license option agreements (including 
agreements with Affymax, Stanford University and the University of 
California) which give it rights to use certain technologies. Failure of the 
Company to maintain rights to such technology could have a material adverse 
effect on the Company's business, financial condition and results of 
operations. For example, inability of the Company to exercise the option for 
the Stanford technology under 

                                                                  Page 22 of 59

<PAGE>

commercially reasonable terms could have an adverse effect on the ability of 
the Company to sell certain of its products. 

The patent positions of pharmaceutical, biopharmaceutical and biotechnology 
companies, including the Company, are generally uncertain and involve complex 
legal and factual questions. There can be no assurance that any of the 
Company's pending patent applications will result in issued patents, that the 
Company will develop additional proprietary technologies that are patentable, 
that any patents issued to the Company or its strategic partners will provide 
a basis for commercially viable products or will provide the Company with any 
competitive advantages or will not be challenged by third parties, or that 
the patents of others will not have an adverse effect on the ability of the 
Company to do business. In addition, patent law relating to the scope of 
claims in the technology fields in which the Company operates is still 
evolving. The degree of future protection for the Company's proprietary 
rights, therefore, is uncertain. Furthermore, there can be no assurance that 
others will not independently develop similar or alternative technologies, 
duplicate any of the Company's technologies, or, if patents are issued to the 
Company, design around the patented technologies developed by the Company. In 
addition, the Company could incur substantial costs in litigation if it is 
required to defend itself in patent suits brought by third parties or if it 
initiates such suits.

Others may have filed and in the future are likely to file patent 
applications that are similar or identical to those of the Company. To 
determine the priority of inventions, the Company may have to participate in 
interference proceedings declared by the United States Patent and Trademark 
Office that could result in substantial cost to the Company. No assurance can 
be given that any such patent application will not have priority over patent 
applications filed by the Company. 

The commercial success of the Company also depends in part on the Company 
neither infringing patents or proprietary rights of third parties nor 
breaching any licenses that may relate to the Company's technologies and 
products. For example, the Company, its collaborators and customers may need 
to acquire a license for an amplification technology to use the GeneChip 
system, and there is no assurance such a license will be available on 
commercially reasonable terms. The Company is aware of third-party patents 
that may relate to the Company's technology, including reagents used in probe 
array synthesis and in probe array assays, probe array scanners, synthesis 
techniques, oligonucleotide amplification techniques, assays, and probe 
arrays. There can be no assurance that the Company will not infringe these 
patents, other patents or proprietary rights of third parties. In addition, 
the Company has received and may in the future receive notices claiming 
infringement from third parties as well as invitations to take licenses under 
third party patents. Any legal action against the Company or its 
collaborative partners claiming damages and seeking to enjoin commercial 
activities relating to the affected products and processes could, in addition 
to subjecting the Company to potential liability for damages, require the 
Company or its collaborative partner to obtain a license in order to continue 
to manufacture or market the affected products and processes. There can be no 
assurance that the Company or its collaborative partners would prevail in any 
such action or that any license (including licenses proposed by third 
parties) required under any such patent would be made available on 
commercially acceptable terms, if at all. There are a significant number of 
United States and foreign patents and patent applications in the Company's 
areas of interest, and the Company believes that there may be significant 
litigation in the industry regarding patent and other intellectual property 
rights. If the Company becomes involved in such litigation, it could consume 
a substantial portion of the Company's managerial and financial 

                                                                  Page 23 of 59

<PAGE>

resources, which could have a material adverse effect on the Company's 
business, financial condition and results of operations. 

The enactment of legislation implementing the General Agreement on Trade and 
Tariffs has resulted in certain changes in United States patent laws that 
became effective on June 8, 1995. Most notably, the term of patent protection 
for patent applications filed on or after June 8, 1995 is no longer a period 
of seventeen years from the date of grant. The new term of United States 
patents will commence on the date of issuance and terminate twenty years 
after the earliest effective filing date of the application. Because the time 
from filing to issuance of biotechnology patent applications in the Company's 
area of interest is often more than three years, a twenty-year term after the 
effective date of filing may result in a substantially shortened term of the 
Company's patent protection which may adversely affect the Company's patent 
position. 

Legislation is pending in Congress that may limit the ability of medical 
device manufacturers in the future to obtain patents on medical procedures 
that are not performed by, or as part of, devices or compositions which are 
themselves patentable. Such legislation, if enacted, could have a material 
adverse effect on the Company's ability to protect its proprietary methods 
and procedures.

The Company also relies upon copyright and trade secret protection for its 
confidential and proprietary information. There can be no assurance, however, 
that such measures will provide adequate protection for the Company's trade 
secrets or other proprietary information. In addition, there can be no 
assurance that proprietary information will not be disclosed, that others 
will not independently develop substantially equivalent proprietary 
information and techniques or otherwise gain access to the Company's 
copyrights and trade secrets or disclose such technology, or that the Company 
can meaningfully protect its trade secrets. 

The Company's academic collaborators have certain rights to publish data and 
information in which the Company has rights. There is considerable pressure 
on academic institutions to publish discoveries in the genetics and genomics 
fields. There can be no assurance that such publication would not adversely 
affect the Company's ability to obtain patent protection for some genes in 
which it may have a commercial interest.

   ATTRACTION AND RETENTION OF KEY EMPLOYEES AND CONSULTANTS

The Company is highly dependent on the principal members of its management 
and scientific staff. The loss of services of any of these persons could have 
a material adverse effect on the Company's product development and 
commercialization objectives. In addition, recruiting and retaining qualified 
scientific personnel to perform future research and development work will be 
critical to the Company's success. There can be no assurance that the Company 
will be able to attract and retain such personnel. 

Product development and commercialization will require additional personnel 
in areas such as diagnostic testing, regulatory affairs, manufacturing and 
marketing. The inability to acquire such services or to develop such 
expertise could have a material adverse effect on the Company's business, 
financial condition and results of operations. 

                                                                  Page 24 of 59

<PAGE>

In addition, the Company relies on its scientific advisors to assist the 
Company in formulating its research and development strategy. All of the 
scientific advisors are employed by employers other than the Company and have 
commitments to other entities that may limit their availability to the 
Company. Some of the Company's scientific advisors also consult for companies 
that may be competitors of the Company.

   EXPOSURE TO PRODUCT LIABILITY CLAIMS

The Company's business exposes it to potential product liability claims that 
are inherent in the testing, manufacturing, marketing and sale of human 
diagnostic and therapeutic products. The Company intends to acquire clinical 
liability insurance. There can be no assurance that it will be able to obtain 
such insurance or general product liability insurance on acceptable terms or 
at reasonable costs or that such insurance will be in sufficient amounts to 
provide the Company with adequate coverage against potential liabilities. A 
product liability claim or recall could have a material adverse effect on the 
Company's business, financial condition and results of operations.

                                                                  Page 25 of 59

<PAGE>

                                   AFFYMETRIX, INC.
                                    June 30, 1996


PART II.  OTHER INFORMATION

ITEM 4.        SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS.

(a)  DATE OF MEETING.

The Annual Meeting of the Shareholders of Affymetrix, Inc. was held on April 
15, 1996.

(b)  ELECTION OF DIRECTORS.
                                Director
                             Continuously
                                Since
                             ------------
John D. Diekman, Ph.D.           1992
Stephen P.A. Fodor, Ph.D.        1993
Paul Berg, Ph.D.                 1993
Douglas M. Hurt                  1995
Vernon R. Loucks, Jr.            1993
Barry C. Ross, Ph.D.             1995
David B. Singer                  1993
John A. Young                    1993
Alejandro C. Zaffaroni, Ph.D.    1992

15,923,262 shares were voted for each director nominee. There were no votes 
against or withheld for any nominee.

(c)  DESCRIPTION OF EACH MATTER VOTED ON AND NUMBER OF VOTES CAST.

                                               For        Against      Withheld
                                            ----------    -------      --------
1.   To approve an Amendment to the 
     Company's 1993 Stock Plan.             16,567,502         0           0

2.   To approve the Company's 1996 
     Nonemployee Directors Stock Option 
     Plan.                                  16,567,502         0           0

3.   To approve an amendment to the 
     Company's Articles of Incorporation 
     to effect a two-for-three reverse 
     stock split of outstanding Common
     Stock.                                 16,560,302     7,200           0

                                                                  Page 26 of 59

<PAGE>


                                               For        Against      Withheld
                                            ----------    -------      --------

4.   To approve an amendment to the 
     Company's Articles of Incorporation 
     to eliminate cumulative voting.        16,567,502         0           0

5.   To approve an amendment to the 
     Company's Articles of Incorporation 
     to prohibit shareholder action by 
     written consent.                       15,750,302   817,200           0

6.   To approve an amendment and 
     restatement of the Company's Articles 
     of Incorporation.                      15,567,502         0           0

7.  To approve an amendment of the 
    Company's By-laws to increase the size
    of the Board of Directors to a range 
    of from six to eleven.                  16,560,302     7,200           0

8.  To approve appointment of the 
    Company's auditors for 1996.            16,567,502         0           0


ITEM 6.        EXHIBITS AND REPORTS ON FORM 8-K

(a)  EXHIBITS.

     Exhibit 10.23  Fourth Amendment to Lease between Sobrato Interests and
                    Affymetrix, Inc. dated May 31, 1996 (3380 Central 
                    Expressway, Santa Clara, CA).

     Exhibit 10.24  Lease between Sobrato Interests and Affymetrix, Inc. dated
                    May 31, 1996 (3450 Central Expressway, Santa Clara, CA).

     Exhibit 11.1   Statement of computation of net loss per share.

     Exhibit 27.0   Financial data schedule.

(b)  REPORTS ON FORM 8-K.

     No reports on Form 8-K were filed during the quarter ended June 30, 1996.

                                                                  Page 27 of 59

<PAGE>


                                      SIGNATURES


Pursuant to the requirements of Section 13 or 15(d) of the Securities 
Exchange Act of 1934, Affymetrix, Inc. has duly caused this report to be 
signed on its behalf by the undersigned, thereunto duly authorized, in the 
City of Santa Clara, State of California, on the dates indicated.


                                   AFFYMETRIX, INC.




      Signature                       Capacity                       Date
      ---------                       --------                       ----

/s/ John D. Diekman          Chief Executive Officer and        August 12, 1996
- ----------------------       Chairman of the Board
John D. Diekman, Ph.D. 


/s/ Stephen P.A. Fodor       President and Chief Operating      August 12, 1996
- -------------------------    Officer
Stephen P.A. Fodor, Ph.D.


/s/ Kenneth J. Nussbacher    Executive Vice President and       August 12, 1996
- -------------------------    Chief Financial Officer
Kenneth J. Nussbacher

                                                                  Page 28 of 59

<PAGE>


                                   AFFYMETRIX, INC.
                                    EXHIBIT INDEX
                                    June 30, 1996



                                                                           Page
                                                                           ----

Exhibit 10.23  Fourth Amendment to Lease between Sobrato Interests and
               Affymetrix, Inc. dated May 31, 1996 (3380 Central 
               Expressway, Santa Clara, CA)...............................   30

Exhibit 10.24  Lease between Sobrato Interests and Affymetrix, Inc. dated
               May 31, 1996 (3450 Central Expressway, Santa Clara, CA)....   32

Exhibit 11.1   Statement of computation of net loss per share.............   58

Exhibit 27.0   Financial data schedule....................................   59

                                                                  Page 29 of 59



<PAGE>


                                                                  EXHIBIT 10.23

                    FOURTH AMENDMENT TO LEASE

This fourth amendment to lease ("Fourth Amendment") is made this 31st day of 
May, 1996 by and between Sobrato Interests, a California limited partnership 
("Landlord") and Affymetrix, a California Corporation ("Tenant"), as 
successor lessee from Affymax Research Institute ("Affymax").

                            WITNESSETH

WHEREAS Landlord and Affymax entered into a lease dated March 5, 1992, a 
First Amendment to Lease dated December 23, 1992, a Second Amendment to Lease 
dated February 7, 1994 and a Third Amendment to Lease dated April 5, 1995 
(collectively the "Lease") for the premises ("Premises") located at 3380 
Central Expressway, Santa Clara, California; and

WHEREAS Tenant was a subtenant under Affymax as to the entire Premises under 
the Lease and the sublease was terminated and Tenant has become the Tenant 
under the Lease in place of Affymax, and;

WHEREAS effective the date of this Fourth Amendment, Landlord and Tenant wish 
to modify the Lease to (i) reflect Tenant's exercise of its option to extend 
the term as defined in paragraph 2 of the Third Amendment to Lease, (ii) 
revise the Option Term as defined in Lease paragraph 36, and (iii) delete the 
references to the 3410 Central lease;

NOW, THEREFORE, in order to effect the intent of the parties as set forth 
above and for good and valuable consideration exchanged between the parties, 
the Lease is amended as follows:

1.  The term of the Lease is extended by 82 months so as to provide for an 
Expiration Date of August 31, 2003.

2.  Base Monthly Rent during the option period shall be according to the 
following:
    November 1, 1996 through August 31, 1998:     $44,505.60 per month
    September 1, 1998 through August 31, 2003:    $52,001.28 per month

                                                                  Page 30 of 59
<PAGE>

3.  The Option Term as defined in Lease paragraph 36 is changed from twelve 
(12) months to thirty-six (36) months.

4.  Paragraph 3 of the First Amendment to Lease is hereby deleted in its 
entirety which paragraph provided that if the Tenant exercises its option to 
extend, the Lease shall be revised to conform to the provisions of the Lease 
with the terms and conditions of the 3410 Central lease ("3410 Central 
Lease").  In addition , the cross default provisions of the Lease are deleted 
whereby a default on the 3410 Lease is a default upon the Lease and a default 
on the Lease is a default on the 3410 Lease.

5.  All defined terms shall have the same meanings as in the Lease, except as 
otherwise stated in this Fourth Amendment.

6.  Except as hereby amended, the Lease and all of the terms, covenants and 
conditions thereof shall remain unmodified and in full force and effect.  In 
the event of any conflict or inconsistency between the terms and provisions 
of this Fourth Amendment and the terms and provisions of the Lease, the terms 
and provisions of this Fourth Amendment shall prevail.

IN WITNESS WHEREOF, the parties hereto have set their hands to this Fourth 
Amendment as of the day and date first above written.

LANDLORD                               TENANT
Sobrato Interests,                     Affymetrix, Inc.,
a California limited partnership       a California corporation



By: /s/ John Michael Sobrato           By: /s/ Stephen P.A. Fodor
    ------------------------------         ------------------------------
Its: General Partner                   Its: President
                                            ------------------------------

                                                                  Page 31 of 59

<PAGE>


                                                                  EXHIBIT 10.24

                              LEASE BETWEEN
                     SOBRATO INTERESTS AND AFFYMETRIX

SECTION
- -------
Parties...................................................................    1
Premises..................................................................    1
Use.......................................................................    1
Term and Rental...........................................................    1
Late Charges..............................................................    2
Possession................................................................    2
Acceptance of Possession and Covenants to Surrender.......................    3
Uses Prohibited...........................................................    4
Alterations and Additions.................................................    4
Maintenance of Premises...................................................    5
    Landlord and Tenant's Obligations Regarding Common Area Costs.........    5
    Common Area Costs.....................................................    5
    Tenant's Allocable Share..............................................    6
    Waiver of Liability...................................................    6
    Tenant's Obligations..................................................    7
Hazard Insurance..........................................................    8
    Tenant's Use..........................................................    8
    Landlord's Insurance..................................................    8
    Tenant's Insurance....................................................    8
    Waiver................................................................    9
Taxes.....................................................................    9
Utilities.................................................................    9
Abandonment...............................................................    9
Free From Liens...........................................................   10
Compliance With Governmental Regulations..................................   10
Toxic Waste and Environmental Damage......................................   11
    Tenant's Responsibility...............................................   11
    Tenant's Indemnity Regarding Hazardous Materials......................   12

                                                                  Page 32 of 59

<PAGE>


    Landlord's Indemnity Regarding Hazardous Materials.....................  12
Indemnity..................................................................  12
Advertisements and Signs...................................................  13
Attorney's Fees............................................................  13
Tenant's Default...........................................................  13
    Remedies...............................................................  14
    Right to Re-enter......................................................  14
    Abandonment............................................................  15
    No Termination.........................................................  15
Surrender of Lease.........................................................  15
Habitual Default...........................................................  16
Landlord's Default.........................................................  16
Notices....................................................................  16
Entry by Landlord..........................................................  17
Destruction of Premises....................................................  17
    Destruction by an Insured Casualty.....................................  17
    Destruction by an Uninsured Casualty...................................  18
Assignment or Sublease.....................................................  18
    Consent by Landlord....................................................  18
    Assignment or Subletting Consideration.................................  19
    No Release.............................................................  19
    Effect of Default......................................................  20
Condemnation...............................................................  20
Effects of Conveyance......................................................  21
Subordination..............................................................  21
Waiver.....................................................................  21
Holding Over...............................................................  22
Successors and Assigns.....................................................  22
Estoppel Certificates......................................................  22
Option to Extend the Lease Term............................................  23
    Grant and Exercise of Option...........................................  23
    Determination of Fair Market Rental....................................  23
Resolution of a Disagreement over the Fair Market Rental...................  24

                                                                  Page 33 of 59

<PAGE>

Options....................................................................  25
Quiet Enjoyment............................................................  25
Brokers....................................................................  25
Authority of Parties.......................................................  25
Miscellaneous Provisions...................................................  26
    Rent...................................................................  26
    Management Fee.........................................................  26
    Performance by Landlord................................................  26
    Interest...............................................................  26
    Rights and Remedies....................................................  26
    Survival of Indemnities................................................  26
    Severability...........................................................  26
    Choice of Law..........................................................  27
    Time...................................................................  27
    Entire Agreement.......................................................  27
    Representations........................................................  27
    Headings...............................................................  27
Exhibit "A"................................................................  28

                                                                  Page 34 of 59

<PAGE>


    1.   Parties:    THIS LEASE, is entered into on this 31st day of May, 
1996, between Sobrato Interests, a California limited partnership, and 
Affymetrix, Inc., a California corporation, hereinafter called respectively 
Landlord and Tenant.

    2.   Premises:    Landlord hereby leases to Tenant, and Tenant hires from 
Landlord those certain Premises with the appurtenances, situated in the City 
of Santa Clara, County of Santa Clara, State of California, and more 
particularly described as follows, to-wit:

That certain real property commonly known and designated as 3450 Central 
Expressway consisting of approximately 45,360 square feet ("Building") and 
159 parking stalls in a project consisting of a total of five (5) buildings, 
including the Premises, totaling 412,171 square feet ("Project") as outlined 
in red on Exhibit "A".  The parking stalls shall be available for Tenant's 
exclusive use but shall not be designated or segregated from the balance of 
the parking area.

    3.   Use:    Tenant shall use the Premises only for the following 
purposes and shall not change the use of the Premises without the prior 
written consent of Landlord:  Office, research, development, testing, light 
manufacturing, ancillary warehouse, and related legal uses.  Landlord makes 
no representation or warranty that any specific use of the Premises desired 
by Tenant is permitted pursuant to any Laws. 

    4.   Term and Rental:    The term ("Lease Term") shall be for 
seventy-eight (78) months, commencing on the 1st day of March, 1997 
("Commencement Date"), and ending on the 31st day of August, 2003, 
("Expiration Date").  In addition to all other sums payable by Tenant under 
this Lease, Tenant shall pay base monthly rent ("Base Monthly Rent") for the 
Premises according to the following schedule:

    March 1, 1997 through August 31, 1998:       $43,092.00 per month
    September 1, 1998 through August 31, 2003:   $50,349.60 per month

Base Monthly Rent shall be due on or before the first day of each calendar 
month during Lease Term.  All sums payable by Tenant under this Lease shall 
be paid in lawful money of the United States of America, without offset or 
deduction, and shall be paid to Landlord at such place or places as may be 
designated from time to time by Landlord.  Base Monthly Rent for any period 
less than a calendar month shall be a pro rata portion of the monthly 
installment.

Concurrently with Tenant's execution of this Lease, Tenant shall pay to 
Landlord the sum of Forty Three Thousand Ninety Two and No/100 Dollars 
($43,092.00) as prepaid rent for the period from March 1, 1997 to March 31, 
1997.

    5.   Late Charges:    Tenant hereby acknowledges that late payment by 
Tenant to Landlord of Base Monthly Rent and other sums due hereunder will 
cause Landlord to incur costs not contemplated by this Lease, the exact 
amount of which will be extremely difficult to ascertain.  Such costs 
include, but are not limited to, administrative, processing, accounting 
charges, and late charges, which may be imposed on Landlord by the terms of 
any contract, revolving credit, mortgage or trust deed covering the Premises. 
Accordingly, if any installment of Base Monthly Rent or any other sum due 
from Tenant shall not be received by Landlord or 

                                                                  Page 35 of 59

<PAGE>

Landlord's designee within ten (10) days after written notice from Landlord 
that such amount is due, Tenant shall pay to Landlord a late charge equal to 
five (5%) percent of such overdue amount which shall be due and payable with 
the payment then delinquent.  Landlord agrees to waive said late charge in 
the event the Base Monthly Rent or other sum due is received within five days 
after receipt by Tenant of Landlord's notice to quit or pay rent.  The 
parties hereby agree that such late charge represents a fair and reasonable 
estimate of the costs Landlord will incur by reason of late payment by 
Tenant.  Acceptance of such late charge by Landlord shall in no event 
constitute a waiver of Tenant's default with respect to such overdue amount, 
nor prevent Landlord from exercising any of the other rights and remedies 
granted hereunder.  In the event that a late charge is payable hereunder, 
whether or not collected, for three (3) consecutive installments of Base 
Monthly Rent, then rent shall automatically become due and payable quarterly 
in advance, rather than monthly, notwithstanding any provision of this Lease 
to the contrary.

IT IS FURTHER MUTUALLY AGREED BETWEEN THE PARTIES AS FOLLOWS:

    6.   POSSESSION:    If Landlord, for any reason whatsoever, cannot 
deliver possession of the said Premises to Tenant at the Commencement Date, 
as hereinbefore specified, this Lease shall not be void or voidable, nor 
shall Landlord be liable to Tenant for any loss or damage resulting 
therefrom;  but in that event the commencement and termination dates of the 
Lease and all other dates affected thereby shall be revised to conform to the 
date of Landlord's delivery of possession.  The above is however, subject to 
the provision that the period of delay of delivery of the Premises shall not 
exceed 90 days from the commencement date herein.  If the period of delay of 
delivery exceeds the foregoing, Tenant, at its option, may cancel this Lease 
and declare it null and void.  Notwithstanding the foregoing, Landlord agrees 
avail itself of all legal remedies to evict the current occupant of the 
Premises if it does not vacate by the expiration date of its lease.

    7.   Acceptance of Possession and Covenants to Surrender:    On the 
Commencement Date, Landlord shall deliver the keys to the Premises to Tenant 
and Tenant shall accept possession from Landlord.  Landlord shall reimburse 
Tenant for the costs to put the HVAC system in good condition and repair, as 
detailed in an inspection report to be issued by Therma Mechanical within 90 
days prior to the Commencement Date.  During the first 8 months of the Lease 
Term, Tenant intends to make significant modifications ("Initial 
Improvements") to the Premises.  Tenant shall comply with the provisions of 
Lease paragraph 9 in its construction of the Initial Improvements.  The 
Tenant agrees on the Expiration Date, or on the sooner termination of this 
Lease, to surrender the Premises to Landlord in good condition and repair, 
reasonable wear and tear excepted.  "Good condition" shall mean that the 
interior walls, floors, suspended ceilings, and carpeting within the Premises 
will be cleaned to the same condition as existed at completion of the Initial 
Improvements, normal wear and tear excepted. Tenant agrees, at its sole cost, 
to remove all phone and data cabling installed by Tenant from the suspended 
ceiling and repair or replace broken ceiling tiles, and relevel the ceiling 
if required.  Tenant shall ascertain from Landlord within thirty (30) days 
before the Expiration Date whether Landlord desires to have the Premises or 
any part or parts thereof restored to their condition as of the completion of 
the Initial Improvements or to cause Tenant to surrender all Alterations in 
place to Landlord.  If Landlord shall so desire, then Tenant shall remove 
such Alterations (except 

                                                                  Page 36 of 59

<PAGE>

Initial Improvements) as Landlord may require and shall repair and restore 
said Premises or such part or parts thereof before the Expiration Date at 
Tenant's sole cost and expense.  Tenant on or before the Expiration Date or 
sooner termination of this Lease, shall remove all its personal property and 
trade fixtures from the Premises, and all property and fixtures not so 
removed shall be deemed to be abandoned by Tenant.  If the Premises are not 
surrendered at the Expiration Date or sooner termination of this Lease in the 
condition required by this paragraph, Tenant shall indemnify, defend, and 
hold harmless Landlord against loss or liability resulting from delay by 
Tenant in so surrendering the Premises including, without limitation, any 
claims made by any succeeding tenant founded on such delay.

Notwithstanding the provisions of this paragraph 7, Landlord shall at its 
sole expense repair all latent defects respecting the Premises.  Landlord's 
obligations with respect to the correction of such defects shall be limited 
to the cost to correct the defective work and Landlord shall not be liable 
for any consequential damages or other loss or damage incurred by Tenant.  It 
is further agreed by the parties that Landlord shall have no obligation to 
repair HVAC or other Building systems serving the previous tenant's 
manufacturing and process areas, including but not limited to wafer 
fabrication areas.

    8.   Uses Prohibited:    Tenant shall not commit, or suffer to be 
committed, any waste upon the said Premises, or any nuisance, or other act or 
thing which may disturb the quiet enjoyment of any other tenant in or around 
the Building or allow any sale by auction upon the Premises, or allow the 
Premises to be used for any unlawful or objectionable purpose, or place any 
loads upon the floor, walls, or ceiling which endanger the structure, or use 
any machinery or apparatus which will in any manner vibrate or shake the 
Building, or place any harmful liquids, waste materials, or hazardous 
materials  in the drainage system of, or upon or in the soils surrounding the 
Building.  No materials, supplies, equipment, finished products or 
semi-finished products, raw materials or articles of any nature or any waste 
materials, refuse, scrap or debris shall be stored upon or permitted to 
remain on any portion of the Premises outside of the Building proper without 
Landlord's prior approval, which approval may be withheld in its sole 
discretion.

    9.   Alterations and Additions:     Tenant shall not make, or suffer to 
be made, any alteration or addition to the said Premises ("Alterations"), or 
any part thereof, without (i) the written consent of Landlord first had and 
obtained, which consent shall not be unreasonably withheld or delayed, and 
(ii) delivering to Landlord the proposed architectural and structural plans 
for all such Alterations.  Any Alterations, except movable furniture and 
trade fixtures, shall become at once a part of the realty and belong to 
Landlord.  Alterations which are not to be deemed as trade fixtures shall 
include heating, lighting, electrical systems, air conditioning, 
partitioning, carpeting, or any other installation which has become an 
integral part of the Premises.  After having obtained Landlord's consent, 
Tenant agrees that it will not proceed to make such Alterations until (i) 
Tenant has obtained all required governmental approvals and permits, and (ii) 
Tenant has provided Landlord reasonable security, in form reasonably approved 
by Landlord, to protect Landlord against mechanics' lien claims.  Tenant 
further agrees to provide Landlord (i) written notice of the anticipated 
start date and actual start date of the work, and (ii) a complete set of 
half-size (15" X 21") vellum as-built drawings.  All Alterations shall be 

                                                                  Page 37 of 59

<PAGE>

constructed in compliance with applicable buildings codes and laws, including 
Title 24 and ADA, and shall be maintained, replaced or repaired at Tenant's 
sole costs and expense. Notwithstanding the foregoing, Tenant shall be 
entitled without obtaining Landlord's consent to make any alteration or 
addition to the Premises which does not affect the structure of the Building, 
provided that each such alteration costs no more than $15,000, and all such 
alterations in any twelve (12) month period do not exceed an aggregate of 
$50,000.

    10.  Maintenance of Premises:    

         A.   Landlord and Tenant's Obligations Regarding Common Area Costs:  
 Landlord shall, at its sole cost and expense, maintain in good condition, 
order, and repair, and replace as and when necessary, the foundation, 
exterior load bearing walls and roof structure of the Building Shell.  
Landlord agrees to perform the maintenance, repair and replacement of those 
items defined in paragraph 10(B) below for which Common Area Costs are 
incurred.  Tenant agrees to reimburse Landlord for the expenses resulting 
from Landlord's payment of Common Area Costs as defined in paragraph 10(B) 
incurred by Landlord because the cost is not directly allocable to or payable 
by a single tenant in the Building or the Project.  Tenant agrees to pay 
Tenant's Allocable Share as defined in paragraph 10(C) of the Common Area 
Costs, as additional rental, within ten (10) days of written invoice from 
Landlord.

         B.   Common Area Costs:    For purposes of calculating Tenant's 
Allocable Share of Building and of Project Costs, the term "Common Area 
Costs" shall mean all costs and expenses of the nature hereinafter described 
which are incurred in connection with ownership, maintenance and operation of 
the Building or the Project in which the Premises are located, as the case 
may be not directly allocable to or payable by a single tenant in the 
Building or the Project, together with such additional facilities as may be 
determined by Landlord to be reasonably desirable or necessary to the 
ownership and operation of the Building and/or Project.  All costs and 
expenses shall be determined in accordance with generally accepted accounting 
principles which shall be consistently applied (with accruals appropriate to 
Landlord's business), including but not limited to, the following:  (i) 
common area utilities, including water and power and lighting to the extent 
not separately metered; (ii) common area maintenance and service agreements 
for the Building or the Project and the equipment therein including, without 
limitation, common area janitorial services, alarm and security services, 
exterior window cleaning, and maintenance of sidewalks, landscaping, 
waterscape, parking areas, and driveways; (iii) insurance premiums and costs, 
including without limitation, the premiums and cost of fire, casualty and 
liability coverage and rental abatement and earthquake (if commercially 
available) insurance applicable to the Building or Project; (iv) repairs, 
replacements and general maintenance (excluding repairs and general 
maintenance paid by proceeds of insurance or by Tenant or other third 
parties, and repairs or alterations attributable solely to tenants of the 
Building or Project other than Tenant); and (v) All real estate taxes, 
special assessments, service payments in lieu of taxes, excises, transit 
charges, housing fund assessment, levies, fees or charges and including any 
substitutes or additions thereto which may occur during the Lease Term (and 
Renewal Terms, if any) of this lease which are assessed, or imposed by any 
public authority upon the Building or Project, the act of entering this 
Lease, the occupancy by Tenant, the rent provided for in this Lease and 
including real estate tax increases due to a sale or transfer of the Building 
or the Project, in which the Premises are located, as such taxes are levied 
or 

                                                                  Page 38 of 59

<PAGE>

appear on the City and County tax bills and assessment rolls.  All special 
assessments shall be paid over the longest period allowed by the taxing 
authority.  This shall be a Net Lease and the Base Monthly Rent shall be paid 
to Landlord absolutely net of all costs and expenses.  The provision for 
payment of Common Area Costs by means of periodic payment of Tenant's 
Allocable Share of Building and/or Project Costs are intended to pass on to 
Tenant and reimburse Landlord for all costs of operating and managing the 
Building and/or Project.

         C.   Tenant's Allocable Share:    For purposes of prorating Common 
Area Costs which Tenant shall pay, Tenant's Allocable Share of Building Costs 
is computed by multiplying the total Common Area Costs for services shared by 
the Building by a fraction, the numerator of which is the rentable square 
footage of the Premises and the denominator of which is the total rentable 
square footage of the Building (excluding common areas).  Tenant's Allocable 
Share of Project Costs shall be computed on a shared service by service 
basis, by multiplying the total Common Area Costs for services shared by the 
Building and one or more buildings in the Project by a fraction, the 
numerator of which is the rentable square footage of the Premises and the 
denominator of which is the total rentable square footage of the Buildings in 
the Project which share the services.  It is understood and agreed by 
Landlord and Tenant that Tenant's Allocable Share of Building Costs is 
100.00% and of Project Costs is 11.01 %. It is understood and agreed that 
Tenant's obligation to share in Common Area Costs shall be adjusted to 
reflect the commencement and termination dates of the Lease Term and are 
subject to recalculation in the event of expansion of the Building or Project.

         D.   Waiver of Liability:     Failure by Landlord to perform any 
defined services, or any cessation thereof, when such failure is caused by 
accident, breakage, repairs, strikes, lockout or other labor disturbances or 
labor disputes of any character, or by any other cause, similar or 
dissimilar, beyond the reasonable control of Landlord, shall not render 
Landlord liable in any respect for damages to either person or property, nor 
be construed as an eviction of Tenant, nor cause an abatement of rent nor 
relieve Tenant from fulfillment of any covenant or agreement hereof.  Should 
any of the equipment or machinery utilized in supplying the services listed 
herein break down, or for any cause cease to function properly, upon receipt 
of written notice from Tenant of any deficiency or failure of any defined 
Services, Landlord shall use reasonable diligence to repair the same 
promptly, but Tenant shall have no right to terminate this Lease, and shall 
have no claim for rebate of rent or damages, on account of any interruptions 
in service occasioned thereby or resulting therefrom.  Tenant waives the 
provisions of California Civil Code Sections 1941 and 1942 concerning the 
Landlord's obligation of tenantability and Tenant's right to make repairs and 
deduct the cost of such repairs from the rent. Landlord shall not be liable 
for a loss of or injury to property, however occurring, through or in 
connection with or incidental to furnishing or its failure to furnish any of 
the foregoing, unless such loss or injury is due to the negligence or willful 
misconduct of Landlord.

         E.   Tenant's Obligations:     Except as provided in 10(A) above, 
Tenant shall, at its sole cost, keep and maintain, repair and replace, said 
Premises and appurtenances and every part hereof, including but not limited 
to, exterior walls, roof membrane, glazing, plumbing, electrical and HVAC 
systems, and all the Tenant Interior Improvements in good and sanitary order, 
condition, and repair; normal wear and tear and damage by casualty excepted.  
Tenant shall provide Landlord with a copy of a service contract between 
Tenant and  a licensed air-

                                                                  Page 39 of 59

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conditioning and heating contractor which contract shall provide for 
bi-monthly maintenance of all air conditioning and heating equipment at the 
Premises.  Tenant shall pay the cost of all air-conditioning and heating 
equipment repairs or replacements which are either excluded from such service 
contract or any existing equipment warranties.  All wall surfaces and floor 
tile are to be maintained in an as good a condition as when Tenant took 
possession free of holes, gouges, or defacements.  Tenant agrees to limit 
attachments to vinyl demountable wall surfaces exclusively to V-joints.

Tenant shall also be responsible for the preventive maintenance of the 
membrane of the roof, which responsibility shall be deemed properly 
discharged if (i) Tenant contracts with a licensed roof contractor who is 
reasonably satisfactory to both Tenant and Landlord, at Tenant's sole cost, 
to inspect the roof membrane at least every six (6) months, with the first 
inspection due the sixth (6th) month after the Commencement Date, and (ii)  
Tenant performs, at Tenant's sole cost, all preventive maintenance 
recommendations made by such contractor within a reasonable time after such 
recommendations are made.  Such preventive maintenance might include acts 
such as clearing storm gutters and drains, removing debris from the roof 
membrane, trimming trees overhanging the roof membrane, applying coating 
materials to seal roof penetrations, repairing blisters, and other routine 
measures.  Tenant shall provide to Landlord a copy of such preventive 
maintenance contract and paid invoices for the recommended work.

    11.  Hazard Insurance:    

         A.   Tenant's Use:    Tenant shall not use, or permit said Premises, 
or any part thereof, to be used, for any purpose other than that for which 
the said Premises are hereby leased;  and no use shall be made or permitted 
to be made of the said Premises, nor acts done, which will cause an increase 
in premiums or a cancellation of any insurance policy covering said Building, 
or any part thereof, nor shall Tenant sell or permit to be kept, used or 
sold, in or about said Premises, any article which may be prohibited by the 
standard form of fire insurance policies.  Tenant shall, at its sole cost and 
expense, comply with any and all requirements, pertaining to said Premises, 
of any insurance organization or company, necessary for the maintenance of 
reasonable fire and public liability insurance, covering said Building and 
appurtenances.

         B.   Landlord's Insurance:    Landlord agrees to purchase and keep 
in force fire and extended coverage, earthquake (at Landlord's election and 
at a commercially reasonable rate), and 12 month rental loss insurance 
covering the Premises in amounts not to exceed the actual insurable value of 
the Building as determined by Landlord's insurance company's appraisers.  The 
Tenant agrees to pay to the Landlord as additional rent, on demand, the full 
cost of said insurance as evidenced by insurance billings to the Landlord, 
and in the event of damage covered by said insurance, the amount of any 
deductible under such policy.  Payment shall be due to Landlord within ten 
(10) days after written invoice to Tenant.  Tenant consents to Landlord's 
current insurance deductible of $5,000.00 and shall have the right to approve 
any future change in the deductible amount.  It is understood and agreed that 
Tenant's obligation under this paragraph will be prorated to reflect the 
commencement and termination dates of this Lease.  

                                                                  Page 40 of 59

<PAGE>

         C.   Tenant's Insurance:    Tenant, at its sole cost, agrees to 
insure its personal property and Alterations for amounts not to exceed their 
actual insurable value and to obtain worker's compensation and public 
liability and property damage insurance for occurrences within the Premises 
with a $5,000,000.00 combined single limit for bodily injury and property 
damage. Tenant shall name Landlord and Landlord's lender as an additional 
insured, shall deliver a copy of the policies and renewal certificates to 
Landlord.  All such policies shall provide for thirty (30) days' prior 
written notice to Landlord of any cancellation, termination, or reduction in 
coverage.  Notwithstanding the above, Landlord retains the right to have 
Tenant provide other forms of insurance which may be reasonably required to 
cover future risks.

         D.   Waiver:    Landlord and Tenant hereby waive any and all rights 
each may have against the other on account of any loss or damage occasioned 
to the Landlord or the Tenant as the case may be, or to the Premises or its 
contents, and which may arise from any risk covered by their respective 
insurance policies, as set forth above.  The parties shall use their 
reasonable efforts to obtain from their respective insurance companies a 
waiver of any right of subrogation which said insurance company may have 
against the Landlord or the Tenant, as the case may be.

    12.  Taxes:    Tenant shall be liable and shall pay prior to delinquency, 
for all taxes and assessments levied against personal property and trade or 
business fixtures, and agrees to pay, as additional rental, all real estate 
taxes and assessment installments (special or general) or other impositions 
or charges which may be levied on the Premises, upon the occupancy of the 
Premises and including any substitute or additional charges which may be 
imposed during, or applicable to the Lease Term including real estate tax 
increases due to a sale or other transfer of the Premises, as they appear on 
the City and County tax bills during the Lease Term, and as they become due.  
It is understood and agreed that Tenant's obligation under this paragraph 
will be prorated to reflect the commencement and termination dates of this 
Lease.  In any time during the Lease Term a tax, excise on rents, business 
license tax, or any other tax, however described, is levied or assessed 
against Landlord, as a substitute in whole or in part for taxes assessed or 
imposed on land or Buildings, Tenant shall pay and discharge his pro rata 
share of such tax or excise on rents or other tax before it becomes 
delinquent, except that this provision is not intended to cover net income 
taxes, inheritance, gift or estate tax imposed upon the Landlord.  In the 
event that a tax is placed, levied, or assessed against Landlord and the 
taxing authority takes the position that the Tenant cannot pay and discharge 
his pro rata share of such tax on behalf of the Landlord, then at the sole 
election of the Landlord, the Landlord may increase the rental charged 
hereunder by the exact amount of such tax and Tenant shall pay such increase 
as additional rent hereunder.

    13.  Utilities:    Tenant shall pay directly to the providing utility all 
water, gas, heat, light, power, telephone and other utilities supplied to the 
Premises.  Landlord shall not be liable for a loss of or injury to property, 
however occurring, through or in connection with or incidental to furnishing 
or failure to furnish any of utilities to the Premises and Tenant shall not 
be entitled to abatement or reduction of any portion of the Base Monthly Rent 
so long as any failure to provide and furnish the utilities to the Premises 
due to any cause beyond the Landlord's reasonable control.

                                                                  Page 41 of 59

<PAGE>

    14.  Abandonment:    Tenant shall not abandon the Premises at any time 
during the Lease Term;  and if Tenant shall abandon or surrender said 
Premises, or be dispossessed by process of law, or otherwise, any personal 
property belonging to Tenant and left on the Premises shall be deemed to be 
abandoned, at the option of Landlord, except such property as may be 
mortgaged to Landlord. Notwithstanding the foregoing, Tenant shall be 
entitled to suspend its operations on the Premises and vacate the Premises 
provided that Tenant continues to timely pay rent and perform all other 
obligations of Tenant under this Lease, and further provided that Tenant 
provides a security guard or other reasonable security protection for the 
Premises.

    15.  Free From Liens:    Tenant shall keep the Premises and the Building 
free from any liens arising out of any work performed, materials furnished, 
or obligations incurred by Tenant or claimed to have been performed for 
Tenant.  In the event Tenant fails to discharge any such lien within ten (10) 
days after receiving notice of the filing, Landlord shall be entitled to 
discharge such lien at Tenant's expense and all resulting costs incurred by 
Landlord, including attorney's fees shall be due from Tenant as additional 
rent.

Notwithstanding the provisions of this paragraph 15, Tenant shall have the 
right to contest such liens if Tenant obtains a bond equal to 150% of the 
amount of such lien to prevent enforcement of the lien during such contest or 
otherwise makes adequate provision to prevent enforcement of the lien during 
such contest.

    16.  Compliance With Governmental Regulations:    Tenant shall, at its 
sole cost and expense, comply with all of the requirements of all Municipal, 
State and Federal authorities now in force, or which may hereafter be in 
force, pertaining to the said Premises, and shall faithfully observe in the 
use of the Premises all Municipal ordinances and State and Federal statutes 
now in force or which may hereafter be in force.  The judgment of any court 
of competent jurisdiction, or the admission of Tenant in any action or 
proceeding against Tenant, whether Landlord be a party thereto or not, that 
Tenant has violated any such ordinance or statute in the use of the Premises, 
shall be conclusive of that fact as between Landlord and Tenant.

Notwithstanding the provisions of this paragraph 16 and excepting Title 24 
and ADA work for which Tenant is responsible, if any improvement or 
alteration to the Premises is required as a result of any future laws or 
regulations affecting the Premises not related to Tenant's specific use of 
the Premises, and provided further said improvement or alteration is not 
required because of alterations to the Premises made by Tenant, the cost of 
such improvements shall be allocated between Landlord and Tenant such that 
Tenant shall pay to Landlord upon completion of such improvement, the portion 
of the cost thereof equal to the remaining number of years in the lease term 
divided by the anticipated useful life of such improvement.  Landlord 
represents and warrants, to the best of its knowledge, that the Building 
shell applies with all building codes that were applicable as of the date of 
its construction.

    17.  Toxic Waste and Environmental Damage:    

         A.   Tenant's Responsibility:    Without the prior written consent 
of Landlord, Tenant shall not bring, use, or permit upon the Premises, or 
generate, emit, or dispose from the Premises any chemicals, toxic or 
hazardous gaseous, liquid or solid materials or waste, including 

                                                                  Page 42 of 59

<PAGE>

without limitation, material or substance having characteristics of 
ignitability, corrosivity, reactivity, or toxicity or substances or materials 
which are listed on any of the Environmental Protection Agency's lists of 
hazardous wastes or which are identified in Sections 66680 through 66685 of 
Title 22 of the California Administrative Code as the same may be amended 
from time to time ("Hazardous Materials").  In order to obtain consent, 
Tenant shall deliver to Landlord its written proposal describing the toxic 
material to be brought onto the Premises, measures to be taken for storage 
and disposal thereof, safety measures to be employed to prevent pollution of 
the air, ground, surface and ground water.  Landlord consents to Tenant's use 
of Hazardous Materials on the Premises on the condition that Tenant 
represents and warrants that Tenant will (i) adhere to all reporting and 
inspection requirements imposed by Federal, State, County or Municipal laws, 
ordinances or regulations and will provide Landlord a copy of any such 
reports or agency inspections, (ii) obtain and provide Landlord copies of all 
necessary permits required for the use and handling Hazardous Materials on 
the Premises, (iii) enforce Hazardous Materials handling and disposal 
practices consistent with industry standards, and (iv) properly close the 
facility with regard to Hazardous Materials including the removal or 
decontamination of any process piping, mechanical ducting, storage tanks, 
containers, or trenches which have come into contact with Hazardous Materials 
and obtain a closure certificate from the local administering agency prior to 
the Expiration Date.  Landlord may employ an independent engineer or 
consultant to periodically inspect Tenant's operations to verify that Tenant 
is complying with its obligations under this paragraph.  In the event it is 
determined by Landlord's consultant that Tenant is in material violation with 
respect to its obligations under this paragraph and such violation has not 
previously been reported by Tenant or has not been cured, then Tenant shall 
pay the reasonable future expense of employing Landlord's independent 
engineer or consultant to periodically inspect Tenant's operations.  The 
forgoing right of inspection shall be exercised by Landlord only if Landlord 
believes it may be subject to liability because of Tenant's handling of 
hazardous materials.  

         B.   Tenants Indemnity Regarding Hazardous Materials:    Tenant 
shall comply, at its sole cost, with all laws pertaining to, and shall 
indemnify and hold Landlord harmless from any claims, liabilities, costs or 
expenses incurred or suffered by Landlord, except through Landlord's 
negligence or willful misconduct, arising from such bringing, using, 
permitting, generating, emitting or disposing of Hazardous Materials.  
Tenant's indemnification and hold harmless obligations include, without 
limitation, (i) claims, liability, costs or expenses resulting from or based 
upon administrative, judicial (civil or criminal) or other action, legal or 
equitable, brought by any private or public person under common law or under 
the Comprehensive Environmental Response, Compensation and Liability Act of 
1980 ("CERCLA"), the Resource Conservation and Recovery Act of 1980 ("RCRA") 
or any other Federal, State, County or Municipal law, ordinance or 
regulation, (ii) claims, liabilities, costs or expenses pertaining to the 
identification, monitoring, cleanup, containment, or removal of Hazardous 
Materials from soils, riverbeds or aquifers including the provision of an 
alternative public drinking water source, and (iii) all costs of defending 
such claims.

         C.   Landlords Indemnity Regarding Hazardous Materials:    Landlord 
shall indemnify and hold Tenant harmless from any claims, liabilities, costs 
or expenses incurred or suffered by Tenant related to the removal, 
investigation, monitoring or remediation of Hazardous Materials which are 
present or which come to be present on the Premises through no fault of 

                                                                  Page 43 of 59

<PAGE>

Tenant.  Landlord's indemnification and hold harmless obligations include, 
without limitation, (i) claims, liability, costs or expenses resulting from 
or based upon administrative, judicial (civil or criminal) or other action, 
legal or equitable, brought by any private or public person under common law 
or under the Comprehensive Environmental Response, Compensation and Liability 
Act of 1980 ("CERCLA"), the Resource Conservation and Recovery Act of 1980 
("RCRA") or any other Federal, State, County or Municipal law, ordinance or 
regulation, (ii) claims, liabilities, costs or expenses pertaining to the 
identification, monitoring, cleanup, containment, or removal of Hazardous 
Materials from soils, riverbeds or aquifers including the provision of an 
alternative public drinking water source, and (iii) all costs of defending 
such claims.  In no event shall Landlord be liable for any consequential 
damages suffered or incurred by Tenant as a result of any such contamination.

    18.  Indemnity:    As a material part of the consideration to be rendered 
to Landlord, Tenant hereby waives all claims against Landlord for damages to 
goods, wares and merchandise, and all other personal property in, upon or 
about said Building, for injuries to persons in or about said Building, or 
for injuries or claims by Tenant's agents or invitees in or about the 
Project, from any cause arising at any time except due to the negligence or 
willful misconduct of Landlord, and Tenant will hold Landlord exempt and 
harmless from any damage or injury to any person, or to the goods, wares and 
merchandise and all other personal property of any person, arising from the 
use of the Premises by Tenant, or from the failure of Tenant to keep the 
Building in good condition and repair, as herein provided.  Further, in the 
event Landlord is made party to any litigation due to the acts or omission of 
Tenant, Tenant will indemnify and hold Landlord harmless from any such claim 
or liability including Landlord's costs and expenses and reasonable 
attorney's fees incurred in defending such claims.

    19.  Advertisements and Signs:    Tenant will not place or permit to be 
placed, in, upon or about the said Premises any unusual or extraordinary 
signs, or any signs not approved by the city or other governing authority.  
The Tenant will not place, or permit to be placed, upon the Premises, any 
signs, advertisements or notices without the written consent of the Landlord 
as to type, size, design, lettering, coloring and location, and such consent 
will not be unreasonably withheld.  Any sign so placed on the Premises shall 
be removed by Tenant, at its expense,  prior to the Expiration Date or 
promptly following the earlier termination of the lease and Tenant shall 
repair any damage or injury to the Premises caused thereby, and if not so 
removed by Tenant then Landlord may have same so removed at Tenant's expense.

    20.  Attorneys Fees:    In case suit should be brought for the possession 
of the Premises, for the recovery of any sum due hereunder, or because of the 
breach of any other covenant herein, the losing party shall pay to the 
prevailing party a reasonable attorney's fee as part of its costs which shall 
be deemed to have accrued on the commencement of such action.

    21.  Tenants Default:    The occurrence of any of the following shall 
constitute a material default and breach of this Lease by Tenant:  a) Any 
failure by Tenant to pay the rental or to make any other payment required to 
be made by Tenant hereunder provided however, that Tenant may cure such 
default by payment to Landlord of the Base Monthly Rent or other sum due 
within ten (10) days after receipt by Tenant of written notice specifying 
Landlord has failed to receive the amount in question; b) The abandonment of 
the Premises by Tenant; c) A failure 

                                                                  Page 44 of 59

<PAGE>

by Tenant to observe and perform any other provision of this Lease to be 
observed or performed by Tenant, where such failure continues for thirty (30) 
days after written notice thereof by Landlord to Tenant;  provided, however, 
that if the nature of such default is such that the same cannot reasonably be 
cured within such thirty (30) day period Tenant shall not be deemed to be in 
default if Tenant shall within such period commence such cure and thereafter 
diligently prosecute the same to completion;  d) The making by Tenant of any 
general assignment for the benefit of creditors; the filing by or against 
Tenant of a petition to have Tenant adjudged a bankrupt or of a petition for 
reorganization or arrangement under any law relating to bankruptcy (unless, 
in the case of a petition filed against Tenant, the same is dismissed after 
the filing);  the appointment of a trustee or receiver to take possession of 
substantially all of Tenant's assets located at the Premises or of Tenant's 
interest in this Lease, where possession is not restored to Tenant within 
thirty (30) days;  or the attachment, execution or other judicial seizure of 
substantially all of Tenant's assets located at the Premises or of Tenant's 
interest in this Lease, where such seizure is not discharged within thirty 
(30) days.  The notice requirements set forth herein are in lieu of and not 
in addition to the notices required by California Code of Civil Procedure 
Section 1161.

         A.   Remedies:    In the event of any such default by Tenant, then 
in addition to any other remedies available to Landlord at law or in equity, 
Landlord shall have the immediate option to terminate this Lease and all 
rights of Tenant hereunder by giving written notice of such intention to 
terminate.  In the event that Landlord shall elect to so terminate this Lease 
then Landlord may recover from Tenant:  a) the worth at the time of award of 
any unpaid rent which had been earned at the time of such termination;  plus 
b) the worth at the time of award of the amount by which the unpaid rent 
would have been earned after termination until the time of award exceeds the 
amount of such rental loss Tenant proves could have been reasonably avoided;  
plus c) the worth at the time of award of the amount by which the unpaid rent 
for the balance of the Lease Term after the time of award exceeds the amount 
of such rental loss that Tenant proves could be reasonably avoided;  plus d) 
any other amount necessary to compensate Landlord for all the detriment 
directly and foreseeably caused by Tenant's failure to perform his 
obligations under this Lease or which in the ordinary course of things would 
be likely to result therefrom, and e) at Landlord's election, such other 
amounts in addition to or in lieu of the foregoing as may be permitted from 
time to time by applicable California law. The term "rent", as used herein, 
shall be deemed to be and to mean the minimum monthly installments of Base 
Monthly Rent and all other sums required to be paid by Tenant pursuant to the 
terms of this Lease, all other such sums being deemed to be additional rent 
due hereunder.  As used in (a) and (b) above, the "worth at the time of 
award" to be computed by allowing interest at the rate of the discount rate 
of the Federal Reserve Bank of San Francisco plus five (5%) percent per 
annum.  As used in (c) above, the "worth at the time of award" to be computed 
by discounting such amount at the discount rate of the Federal Reserve Bank 
of San Francisco at the time of award plus one (1%) percent.

         B.   Right to Re-enter:     In the event of any such default by 
Tenant, Landlord shall also have the right, with or without terminating this 
Lease, to re-enter the Premises and remove all persons and property from the 
Premises;  such property may be removed and stored in a public warehouse or 
elsewhere at the cost of and for the account of Tenant and disposed of by 
Landlord in any manner permitted by law.

                                                                  Page 45 of 59

<PAGE>

         C.   Abandonment:     In the event of the abandonment of the 
Premises by Tenant or in the event that Landlord shall elect to re-enter as 
provided in paragraph 21(B) above or shall take possession of the Premises 
pursuant to legal proceeding or pursuant to any notice provided by law, then 
if Landlord does not elect to terminate this Lease as provided in paragraph 
21(A) above, then the provisions of California Civil Code Section 1951.4, as 
amended from time to time, shall apply and Landlord may from time to time, 
without terminating this Lease, either recover all rental as it becomes due 
or relet the Premises or any part thereof for such term or terms and at such 
rental or rentals and upon such other terms and conditions as Landlord in its 
sole discretion may deem advisable with the right to make alterations and 
repairs to the Premises.  In the event that Landlord shall elect to so relet, 
then rentals received by Landlord from such reletting shall be applied:  
first, to the payment of any indebtedness other than Base Monthly Rent due 
hereunder from Tenant to Landlord;  second, to the payment of any cost of 
such reletting;  third, to the payment of the cost of any reasonable 
alterations and repairs to the Premises;  fourth, to the payment of Base 
Monthly Rent due and unpaid hereunder;  and the residue, if any, shall be 
held by Landlord and applied in payment of future Base Monthly Rent as the 
same may become due and payable hereunder.  Should that portion of such 
rentals received from such reletting during any month, which is applied by 
the payment of rent hereunder, be less than the rent payable during that 
month by Tenant hereunder, then Tenant shall pay such deficiency to Landlord 
immediately upon demand therefor by Landlord.  Such deficiency shall be 
calculated and paid monthly.  Tenant shall also pay to Landlord, as soon as 
ascertained, any costs and expenses incurred by Landlord in such reletting or 
in making such alterations and repairs not covered by the rentals received 
from such reletting.

         D.   No Termination:     No re-entry or taking possession of the 
Premises by Landlord pursuant to 21(B) or 21(C) of this Article 22 shall be 
construed as an election to terminate this Lease unless a written notice of 
such intention be given to Tenant or unless the termination thereof be 
decreed by a court of competent jurisdiction. Notwithstanding any reletting 
without termination by Landlord because of any default by Tenant, Landlord 
may at any time after such reletting elect to terminate this Lease for any 
such default.

    22.  Surrender of Lease:    The voluntary or other surrender of this 
Lease by Tenant, or a mutual cancellation thereof, shall not automatically 
effect a merger of the Lease with Landlord's ownership of the Building or 
Premises. Instead, at the option of Landlord, Tenant's surrender may 
terminate all or any existing sublease or subtenancies, or may operate as an 
assignment to Landlord of any or all such subleases or subtenancies, thereby 
creating a direct Landlord-Tenant relationship between Landlord and any 
subtenants.

    23.  Habitual Default:    Notwithstanding anything to the contrary 
contained in paragraph 21, 21 (A) (B) (C) and (D), the parties hereto agree 
that if the Tenant shall have defaulted in the performance of any (but not 
necessarily the same) term or condition of this Lease for three or more times 
during any twelve month period during the Lease Term hereof, then such 
conduct shall, at the election of the Landlord, represent a separate event of 
default which cannot be cured by the Tenant.  Tenant acknowledges that the 
purpose of this provision is to prevent repetitive defaults by the Tenant 
under the Lease, which work a hardship upon the Landlord, and deprive the 
Landlord of the timely performance by the Tenant hereunder.

                                                                  Page 46 of 59

<PAGE>

    24.  Landlords Default:    In the event of Landlord's failure to perform 
any of its covenants or agreements under this Lease, Tenant shall give 
Landlord written notice of such failure and shall give Landlord thirty (30) 
days or such other reasonable opportunity to cure or to commence to cure such 
failure prior to any claim for breach or for damages resulting from such 
failure.  In addition, upon any such failure by Landlord, Tenant shall give 
notice by registered or certified main to any person or entity with a 
security interest in the Premises ("Mortgagee") that has provided Tenant with 
notice of its interest in the Premises, and shall provide such Mortgagee a 
reasonable opportunity to cure such failure, including such time to obtain 
possession of the Premises by power of sale or judicial foreclosure, if such 
should prove necessary to effectuate a cure.  Tenant agrees that each of the 
Mortgagees to whom this Lease has been assigned is an expressed third party 
beneficiary hereof.  Tenant shall not make any prepayment of rent more than 
one (1) month in advance without the prior written consent of such Mortgagee. 
 Tenant waives any right under California Civil Code Section 1950.7 or any 
other present or future law to the collection of any payment or deposit from 
such Mortgagee or any purchaser at a foreclosure sale of such Mortgagee's 
interest unless such Mortgagee or such purchaser shall have actually received 
and not refunded the applicable payment or deposit. 

    25.  Notices:    All notices, demands, requests, or consents required to 
be given under this Lease shall be sent in writing by U.S. certified mail, 
return receipt requested, or by personal delivery addressed to the party to 
be notified at the address for such party specified in paragraph 1 of this 
Lease, or to such other place as the party to be notified may from time to 
time designate by at least fifteen (15) days prior notice to the notifying 
party.

    26.  Entry by Landlord:    Tenant shall permit Landlord and his agents to 
enter into and upon said Premises at all reasonable times subject to any 
security regulations of Tenant for the purpose of inspecting the same or for 
the purpose of maintaining the Premises or for the purpose of making repairs, 
alterations or additions to any other portion of said Premises or for the 
purpose of erecting additional building(s) and improvements on the land where 
the Premises are situated, or on adjacent land owned by Landlord, including 
the erection and maintenance of such scaffolding, canopies, fences and props 
as may be required without any abatement or reduction of Base Monthly Rent or 
without any liability to Tenant for any loss of occupation or quiet enjoyment 
of the Premises thereby occasioned; and Tenant shall permit Landlord and his 
agents, at any time within one hundred eighty (180) days prior to the 
Expiration Date (or at any time during the Lease if Tenant is in default 
hereunder), to place upon the Premises any "For Sale" or "For Lease" signs 
and exhibit the Premises to real estate brokers and prospective tenants at 
reasonable hours.  Landlord shall comply with Tenant's security procedures 
applicable to the Premises and shall not unreasonably interfere with Tenant's 
use of the Premises.

    27.  Destruction of Premises:    

         A.   Destruction by an Insured Casualty:    In the event of a 
partial destruction of the Premises by a casualty for which Landlord has 
received insurance proceeds sufficient to repair the damage or destruction 
during the Lease Term from any cause, Landlord shall forthwith repair the 
same, provided such repairs can be made within one hundred eighty (180) days 
from the date of receipt of all necessary governmental approvals necessary 
under the laws and regulations of State, Federal, County or Municipal 
authorities, such partial destruction shall in no 

                                                                  Page 47 of 59

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way annul or void this Lease, except that Tenant shall be entitled to a 
proportionate reduction of Base Monthly Rent while such repairs are being 
made, such proportionate reduction to be based upon the extent to which the 
making of such repairs shall interfere with the business carried on by Tenant 
in the Premises.  For purposes of this paragraph "partial destruction" shall 
mean destruction of no greater than one-third (1/3) of the replacement cost 
of the Premises, including the replacement cost of the Tenant Improvements 
paid for by Landlord.  In the event the Premises are more than partially 
destroyed, or in the event the repairs cannot be made in one hundred eighty 
(180) days, Landlord or Tenant may elect to terminate this Lease.  Landlord 
shall not be required to restore Alterations or replace Tenant's fixtures or 
personal property.  In respect to any partial destruction which Landlord is 
obligated to repair or may elect to repair under the terms of this paragraph, 
the provision of Section 1932, Subdivision 2, and of Section 1933, 
Subdivision 4, of the Civil Code of the State of California and any other 
similarly enacted statue are waived by Tenant and the provisions of this 
paragraph 28 shall govern in the case of such destruction.  

         B.   Destruction by an Uninsured Casualty:    In the event of a 
total or partial destruction of the Premises by an uninsured casualty, the 
Lease shall automatically terminate, unless Landlord elects to rebuild.  In 
the event of a destruction by an uninsured casualty (i) of greater than 
one-third (1/3) of the replacement cost of the Premises, or (ii) that can not 
be repaired within one hundred eighty (180) days, Tenant may elect to 
terminate this Lease.  

    28.  Assignment or Sublease:    

         A.   Consent by Landlord:    In the event Tenant desires to assign 
this Lease or any interest therein including, without limitation, a pledge, 
mortgage or other hypothecation, or sublet the Premises or any part thereof, 
Tenant shall deliver to Landlord substantially complete forms of any such 
agreement and of all ancillary agreements with the proposed assignee or 
subtenant, financial statements, and any additional information as reasonably 
required to determine whether it will consent to the proposed assignment or 
sublease.  The notice shall give the name and current address of the proposed 
assignee/subtenant, proposed use of the Premises, rental rate and current 
financial statement;  and upon request to Tenant, Landlord shall be given 
additional information as reasonably required to determine whether it will 
consent to the proposed assignment or sublease.  Landlord shall then have a 
period of ten (10) days following receipt of such notice within which to 
notify Tenant in writing that Landlord elects (i) to terminate this Lease as 
to the space so affected as of the date so specified by Tenant in which event 
Tenant will be relieved of all further obligations hereunder as to such space 
(in which case Landlord shall be responsible for the payment of any real 
estate commissions due), (ii) to permit Tenant to assign or sublet such space 
to the named assignee/subtenant on the terms and conditions set forth in the 
notice, or (iii) to refuse consent.  If Landlord should fail to notify Tenant 
in writing of such election within said ten (10) day period, Landlord shall 
be deemed to have elected option (ii) above.  If Landlord exercises its 
option to terminate this Lease in part in the event Tenant desires to sublet 
or assign part of the Premises, then (i) this Lease shall end and expire, 
with respect to such part of the Premises, on the date upon which the 
proposed sublease was to commence, and (ii) from and after such date, the 
Base Monthly Rent and Tenant's allocable share of all other costs and charges 
shall be adjusted, based upon the proportion that the rentable area of the 
Premises remaining bears to the total rentable area of the Premises.  If 

                                                                  Page 48 of 59

<PAGE>

Landlord does not exercise its option to terminate this Lease, Landlord's 
consent (which must be in writing and in form reasonably satisfactory to 
Landlord) to the proposed assignment or sublease shall not be unreasonably 
withheld or delayed, provided and upon condition that: (i)  The proposed 
assignee or subtenant is engaged in a business that is limited to the use 
expressly permitted under this Lease; (ii)  The proposed sublease shall be in 
form reasonably satisfactory to Landlord; (iii)  Tenant shall reimburse 
Landlord on demand for any costs that may be incurred by Landlord in 
connection with said assignment or sublease, including the costs of making 
investigations as to the acceptability of the proposed assignee or subtenant 
and legal costs incurred in connection with the granting of any requested 
consent; and (iv)  Tenant shall not have advertised or publicized in any way 
the availability of the Premises without prior notice to Landlord.

Notwithstanding the provisions of this paragraph 28, Tenant may, without 
Landlord's prior written consent and without Landlord's participation in 
subleasing profits, sublet the Premises or assign the Lease to:  (i) a 
subsidiary, affiliate, division or corporation controlled or under common 
control with Tenant; (ii) a successor corporation related to Tenant by 
merger, consolidation, non-bankruptcy reorganization, or government action; 
or (iii) a purchaser of substantially all of Tenant's assets.  For the 
purpose of this Lease, sale of Tenant's capital stock through any public 
exchange shall not be deemed an assignment, subletting, or any other transfer 
of the Lease or the Premises.

         B.   Assignment or Subletting Consideration:    Any rent or other 
economic consideration realized by Tenant under any such sublease and 
assignment in excess of the rent payable hereunder (including an allocation 
of the purchase price attributable to Tenant's leasehold interest in the 
event of a sale of the Tenant's business), after the net unamortized cost of 
the Tenant Improvements for which Tenant has itself paid, and reasonable 
subletting and assignment costs, shall be divided and paid sixty-seven 
percent (67%) to Landlord and thirty-three percent (33%) to Tenant.  Tenant's 
obligation to pay over Landlord's portion of the consideration shall 
constitute an obligation for additional rent hereunder.  The above provisions 
relating to Landlord's right to terminate the Lease and relating to the 
allocation of bonus rent are independently negotiated terms of the Lease, 
constitute a material inducement for the Landlord to enter into the Lease, 
and are agreed as between the parties to be commercially reasonable.  No 
assignment or subletting by Tenant shall relieve Tenant of any obligation 
under this Lease.  Any assignment or subletting which conflicts with the 
provisions hereof shall be void.

         C.   No Release:    Any assignment or sublease shall be made only if 
and shall not be effective until the assignee or subtenant shall execute, 
acknowledge and deliver to Landlord an agreement, in form and substance 
satisfactory to Landlord, whereby the assignee or subtenant shall assume all 
of the obligations of this Lease on the part of Tenant to be performed or 
observed and shall be subject to all of the covenants, agreements, terms, 
provisions and conditions contained in this Lease.  Notwithstanding any such 
sublease or assignment and the acceptance of rent or additional rent by 
Landlord from any subtenant or assignee, Tenant or any guarantor shall and 
will remain fully liable for the payment of the rent and additional rent due, 
and to become due hereunder, for the performance of all of the covenants, 
agreements, terms, provisions and conditions contained in this Lease on the 
part of Tenant to be performed and for all acts and omissions of any 
licensee, subtenant, assignee or any other person claiming under or 

                                                                  Page 49 of 59

<PAGE>

through any subtenant that shall be in violation of any of the terms and 
conditions of this Lease, and any such violation shall be deemed to be a 
violation by Tenant.  Tenant shall further indemnify, defend and hold 
Landlord harmless from and against any and all losses, liabilities, damages, 
costs and expenses (including reasonable attorney fees) resulting from any 
claims that may be made against Landlord by the proposed assignee or 
subtenant or by any real estate brokers or other persons claiming a 
commission or similar compensation in connection with the proposed assignment 
or sublease.  

         D.   Effect of Default:    In the event of Tenant's default, Tenant 
hereby assigns all rents due from any assignment or subletting to Landlord as 
security for performance of its obligations under this Lease and Landlord may 
collect such rents as Tenant's Attorney-in-Fact, except that Tenant may 
collect such rents unless a default occurs as described in paragraph 21 
above.  The termination of this Lease due to Tenant's default shall not 
automatically terminate any assignment or sublease then in existence.  At the 
election of Landlord, the assignee or subtenant shall attorn to Landlord and 
Landlord shall undertake the obligations of the Tenant under the sublease or 
assignment; provided the Landlord shall not be liable for prepaid rent, 
security deposits or other defaults of the Tenant to the subtenant or 
assignee, or any acts or omissions of Tenant, its agents, employees or 
invitees.

    29.  Condemnation:    If any part of the Premises shall be taken for any 
public or quasi-public use, under any statute or by right of eminent domain 
or private purchase in lieu thereof, and a part thereof remains which is 
susceptible of occupation hereunder, this Lease shall as to the part so 
taken, terminate as of the date title shall vest in the condemnor or 
purchaser, and the Base Monthly Rent payable hereunder shall be adjusted so 
that the Tenant shall be required to pay for the remainder of the Lease Term 
only such portion of such rent as the value of the part remaining after such 
taking bears to the value of the entire Premises prior to such taking;  but 
in such event Landlord shall have the option to terminate this Lease as of 
the date when title to the part so taken vests in the condemnor or purchaser. 
 If all of the Premises, or such part thereof be taken so that there does not 
remain a portion susceptible for occupation hereunder, this Lease shall 
thereupon terminate.  If a part or all of the Premises be taken, all 
compensation awarded upon such taking shall go to the Landlord and the Tenant 
shall have no claim thereto but Landlord shall cooperate with Tenant to 
recover compensation for damage to or taking of any Alterations or for 
Tenant's moving costs.  Tenant hereby waives the provisions of California 
Code of Civil Procedures Section 1265.130 and any other similarly enacted 
statue are waived by Tenant and the provisions of this paragraph 30 shall 
govern in the case of such destruction.

    30.  Effects of Conveyance:    The term Landlord as used in this Lease, 
means only the owner for the time being of the land and Building, containing 
the Premises, so that, in the event of any sale or other conveyance of said 
land or Building, or in the event of a master Lease of the Building, the 
Landlord shall be and hereby is entirely freed and relieved of all covenants 
and obligations of the Landlord hereunder, and it shall be deemed and 
construed, without further agreement between the parties and the purchaser at 
any such sale, or the master tenant of the Building, that the purchaser or 
master tenant of the Building has assumed and agreed to carry out any and all 
covenants and obligations of the Landlord hereunder.  Landlord shall transfer 
and deliver Tenant's security deposit, to the purchaser at any such sale or 
the master tenant of the 

                                                                  Page 50 of 59

<PAGE>

Building, and thereupon the Landlord shall be discharged from any further 
liability in reference thereto.

    31.  Subordination:    In the event Landlord notifies Tenant in writing, 
this Lease shall be subordinate to any ground Lease, deed of trust, or other 
hypothecation for security now or hereafter placed upon the real property of 
which the Premises are a part and to any and all advances made on the 
security thereof and to renewals, modifications, replacements and extensions 
thereof. Tenant agrees to promptly execute and deliver any documents which 
may be required to effectuate such subordination.  Notwithstanding such 
subordination, Tenant's right to quiet possession of the Premises shall not 
be disturbed if Tenant is not in default and so long as Tenant shall pay the 
rent and observe and perform all of the provisions of this Lease.  At the 
request of any lender, Tenant agrees to execute and deliver any reasonable 
modifications of this Lease which do not materially adversely affect Tenant's 
rights hereunder.

    32.  Waiver:    The waiver by Landlord of any breach of any term, 
covenant or condition, herein contained shall not be deemed to be a waiver of 
such term, covenant or condition or any subsequent breach of the same or any 
other term, covenant or condition herein contained.  The subsequent 
acceptance of rent hereunder by Landlord shall not be deemed to be a waiver 
of any preceding breach by Tenant of any term, covenant or condition of this 
Lease, other than the failure of Tenant to pay the particular rental so 
accepted, regardless of Landlord's knowledge of such preceding breach at the 
time of acceptance of such rent.  No delay or omission in the exercise of any 
right or remedy by Landlord shall impair such right or remedy or be construed 
as a waiver thereof by Landlord.  No act or conduct of Landlord, including, 
without limitation, the acceptance of keys to the Premises shall constitute 
acceptance of the surrender of the Premises by Tenant before the Expiration 
Date.  Landlord's consent to or approval of any act by Tenant which require 
Landlord's consent or approvals shall not be deemed to waive or render 
unnecessary Landlord's consent to or approval of any subsequent act by 
Tenant.  

    33.  Holding Over:    Any holding over after the termination or 
Expiration Date, shall be construed to be a tenancy from month to month 
terminable on thirty (30) days written notice from either party and Tenant 
shall pay Base Monthly Rent to Landlord at a rate equal to the greater of (i) 
one hundred fifty percent (150%) of the Base Monthly Rent due in the month 
preceding the termination or Expiration Date or (ii) one hundred fifty 
percent (150%) of the Fair Market Rental (as defined in paragraph 36).  Any 
holding over shall otherwise be on the terms and conditions herein specified, 
except those provisions relating to the Lease Term and any options to extend 
or renew, which provisions shall be of no further force and effect following 
the expiration of the applicable exercise period.  Tenant shall indemnify, 
defend, and hold Landlord harmless from all loss or liability (including, 
without limitation, any loss or liability resulted from any claim against 
Landlord made by any succeeding tenant) founded on or resulting from Tenant's 
failure to surrender the Premises and losses to Landlord due to lost 
opportunities to lease the Premises to succeeding tenants.  

    34.  Successors and Assigns:    The covenants and conditions herein 
contained shall, subject to the provisions of paragraph 27, apply to and bind 
the heirs, successors, executors, administrators and assigns of all the 
parties hereto;  and all of the parties hereto shall be jointly and severally 
liable hereunder.

                                                                  Page 51 of 59

<PAGE>

    35.  Estoppel Certificates:    Tenant shall at any time during the Lease 
Term, within ten (10) business days following written notice from Landlord, 
execute and deliver to Landlord a statement in writing certifying that this 
Lease is unmodified and in full force and effect (or, if modified, stating 
the nature of such modification) and the date to which the rent and other 
charges are paid in advance, if any, and acknowledging that there are not, to 
Tenant's knowledge, any uncured defaults on the part of Landlord hereunder or 
specifying such defaults if they are claimed.  Any such statement may be 
conclusively relied upon by any prospective purchaser or encumbrancer of the 
Premises. Tenant's failure to deliver such statement within such time shall 
be conclusive upon the Tenant that:  (i) this Lease is in full force and 
effect, without modification except as may be represented by Landlord;  (ii) 
there are not uncured defaults in Landlord's performance.  Tenant also agrees 
to provide the most current three (3) years of audited financial statements 
within ten (10) business days of a request by Landlord for Landlord's use in 
financing the Premises with commercial lenders.

    36.  Option to Extend the Lease Term:

         A.   Grant and Exercise of Option:    Landlord hereby grants to 
Tenant, upon and subject to the terms and conditions set forth in this 
paragraph, the option (the "Option") to extend the Lease Term for an 
additional term (the "Option Term"), which Option Term shall be a period of 
thirty-six (36) months.  The Option Term shall be exercised, if at all, by 
written notice to Landlord on or before the date that is nine (9) months 
prior to the Expiration Date.  If Tenant exercises the Option, each of the 
terms, covenants and conditions of this Lease except this paragraph shall 
apply during the Option Term as though the expiration date of the Option Term 
was the date originally set forth herein as the Expiration Date, provided 
that the Base Monthly Rent to be paid shall be the greater of (i) the Base 
Monthly Rent applicable to the period immediately prior to the commencement 
of the Option Term, or (ii) the Fair Market Rental, as hereinafter defined, 
for the Premises for the Option Term.  Anything contained herein to the 
contrary notwithstanding, if Tenant is in monetary or material non-monetary 
default under any of the terms, covenants or conditions of this Lease either 
at the time Tenant exercises the Option or at any time thereafter prior to 
the commencement date of the Option Term, Landlord shall have, in addition to 
all of Landlord's other rights and remedies provided in this Lease, the right 
to terminate the Option upon notice to Tenant, in which event the expiration 
date of this Lease shall be and remain the Expiration Date. As used herein, 
the term "Fair Market Rental" for the Premises shall mean the rental and all 
other monetary payments including any escalations and adjustments thereto 
(including without limitation Consumer Price Indexing) then being obtained 
for new leases of space comparable in age and quality to the Premises in the 
locality of the Building that Landlord could obtain during the Option Term 
from a third party desiring to lease the Premises for the Option Term. Fair 
Market Rental shall further take into account that (i) that Tenant is in 
occupancy of the Premises and making functional use of the space in its then 
existing condition, and (ii) that no brokerage commission is payable. 

         B.   Determination of Fair Market Rental:    If Tenant exercises the 
Option, Landlord shall send to Tenant a notice setting forth the Fair Market 
Rental for the Premises for the Option Term, on or before the date that is 
one hundred fifty (150) days prior to the Expiration Date.  If Tenant 
disputes Landlord's determination of the Fair Market Rental for the Option 

                                                                  Page 52 of 59

<PAGE>

Term, Tenant shall, within thirty (30) days after the date of Landlord's 
notice setting forth the Fair Market Rental for the Option Term, send to 
Landlord a notice stating that Tenant either (i) elects to terminate its 
exercise of the Option, in which event the Option shall lapse and this Lease 
shall terminate on the Expiration Date, or (ii) disagrees with Landlord's 
determination of Fair Market Rental for the Option Term and elects to resolve 
the disagreement as provided in paragraph 36(C) below. If Tenant does not 
send to Landlord a notice as provided in the previous sentence, Landlord's 
determination of the Fair Market Rental shall be the basis for determining 
the Base Monthly Rent to be paid by Tenant hereunder during the Option Term.  
If Tenant elects to resolve the disagreement as provided in paragraph 36(C) 
below and such procedures shall not have been concluded prior to the 
commencement date of the Option Term, Tenant shall pay Base Monthly Rent to 
Landlord hereunder adjusted to reflect the Fair Market Rental as determined 
by Landlord in the manner provided above. If the amount of Fair Market Rental 
as finally determined pursuant to in paragraph 36(C) below is greater than 
Landlord's determination, Tenant shall pay to Landlord the difference between 
the amount paid by Tenant and the Fair Market Rental as so determined in 
paragraph 36(C) below within thirty (30) days after the determination. If the 
Fair Market Rental as finally determined in paragraph 36(C) below is less 
than Landlord's determination, the difference between the amount paid by 
Tenant and the Fair Market Rental as so determined in paragraph 36(C) below 
shall be credited against the next installments of rent due from Tenant to 
Landlord hereunder.

         C.   Resolution of a Disagreement over the Fair Market Rental:    
Any disagreement regarding the Fair Market Rental shall be resolved as 
follows:

              1.   Within thirty (30) days after Tenant's response to 
Landlord's notice to Tenant of the Fair Market Rental, Landlord and Tenant 
shall meet no less than two (2) times, at a mutually agreeable time and 
place, to attempt to resolve any such disagreement.

              2.   If within the thirty (30) day period referred to in (i) 
above, Landlord and Tenant can not reach agreement as to the Fair Market 
Rental, they shall each select one appraiser to determine the Fair Market 
Rental.  Each such appraiser shall arrive at a determination of the Fair 
Market Rental and submit their conclusions to Landlord and Tenant within 
thirty (30) days after the expiration of the thirty (30) day consultation 
period described in (i) above.

              3.   If only one appraisal is submitted within the requisite 
time period, it shall be deemed to be the Fair Market Rental.  If both 
appraisals are submitted within such time period, and if the two appraisals 
so submitted differ by less than ten percent (10%) of the higher of the two, 
the average of the two shall be the Fair Market Rental.  If the two 
appraisals differ by more than ten percent (10%) of the higher of the two, 
then the two appraisers shall immediately select a third appraiser who shall 
within thirty (30) days after his or her selection make a determination of 
the Fair Market Rental and submit such determination to Landlord and Tenant. 
This third appraisal will then be averaged with the closer of the two 
previous appraisals and the result shall be the Fair Market Rental.

              4.   All appraisers specified pursuant to this paragraph shall 
be members of the American Institute of Real Estate Appraisers with not less 
than ten (10) years 

                                                                  Page 53 of 59

<PAGE>

experience appraising office and industrial properties in the Santa Clara 
Valley.  Each party shall pay the cost of the appraiser selected by such 
party and one-half of the cost of the third appraiser plus one-half of any 
other costs incurred in resolving the dispute pursuant to this paragraph.

    37.  Options:    All Options provided Tenant in this Lease are personal 
and granted to original Tenant or its affiliates and are not exercisable by 
any third party should Tenant assign or sublet all or a portion of its rights 
under this Lease, unless Landlord consents to permit exercise of any option 
by any assignee or subtenant, in Landlord's sole discretion.  In the event 
that Tenant hereunder has any multiple options to extend this Lease, a later 
option to extend the Lease cannot be exercised unless the prior option has 
been so exercised.

    38.  Quiet Enjoyment:    Upon Tenant's faithful and timely performance of 
all the terms and covenants of the Lease, Tenant shall quietly have and hold 
the Premises for the Lease Term and any extensions thereof.

    39.  Brokers:    Tenant represents it has not utilized or contacted a 
real estate broker or finder with respect to this Lease and Tenant agrees to 
indemnify and hold Landlord harmless against any claim, cost, liability or 
cause of action asserted by any broker or finder claiming through Tenant.

    40.  This section intentionally left blank

    41.  Authority of PARTIES:    Each individual executing this Lease on 
behalf of Tenant represents and warrants that he is duly authorized to 
execute and deliver this Lease on behalf of the corporation, in accordance 
with a duly adopted resolution of the Board of Directors of said corporation 
or in accordance with the by-laws of said corporation, and that this Lease is 
binding upon said corporation in accordance with its terms.  Each individual 
executing this Lease on behalf of Landlord represents and warrants that he is 
duly authorized to execute and deliver this Lease on behalf of the limited 
partnership and that this Lease is binding upon said limited partnership in 
accordance with its terms.

    42.  Miscellaneous Provisions:

         A.   Rent:    All monetary sums due from Tenant to Landlord under 
this Lease shall be deemed to be rent.

         B.   Management Fee:    All maintenance and utility services 
administered by Landlord and subject to reimbursement by Tenant shall include 
a property management fee to Landlord of fifteen percent (15%). 

         C.   Performance by Landlord:    If Tenant fails to perform any 
obligation required under this Lease or by law or governmental regulation, 
Landlord in its sole discretion may without notice perform such obligation, 
in which event Tenant shall pay Landlord as additional rent all sums paid by 
Landlord in connection with such substitute performance within ten (10) days 
following Landlord's written notice for such payment. 

                                                                  Page 54 of 59

<PAGE>

         D.   Interest:    All sums due hereunder, including rent and 
additional rent, if not paid when due, shall bear interest at the maximum 
rate permitted under California law accruing from the date due until the date 
paid to Landlord.

         E.   Rights and Remedies:    All rights and remedies hereunder are 
cumulative and not alternative to the extent permitted by law and are in 
addition to all other rights and remedies in law and in equity.

         F.   Survival of Indemnities:  All indemnification, defense, and 
hold harmless obligations of Landlord and Tenant under the Lease shall 
survive the expiration or sooner termination of the Lease.  

         G.   Severability:    If any term or provision of this Lease is held 
unenforceable or invalid by a court of competent jurisdiction, the remainder 
of the Lease shall not be invalidated thereby but shall be enforceable in 
accordance with its terms, omitting the invalid or unenforceable term.

         H.   Choice of Law:    This Lease shall be governed by and construed 
in accordance with California law.

         I.   Time:    Time is of the essence hereunder.

         J.   Entire Agreement:    This instrument contains all of the 
agreements and conditions made between the parties hereto and may not be 
modified orally or in any other manner than by an agreement in writing signed 
by all of the parties hereto or their respective successors in interest.

         K.   Representations:    Tenant acknowledges that neither Landlord 
or its affiliates or agents have made any agreements, representations, 
warranties or promises with respect to the demised Premises or the Building 
of which they are a part, or with respect to present or future rents, 
expenses, operations, tenancies or any other matter.  Except as herein 
expressly set forth herein, Tenant relied on no statement of Landlord or its 
agents for that purpose.

         L.   Headings:    The headings or titles to the paragraphs of this 
Lease are not a part of this Lease and shall have no effect upon the 
construction or interpretation of any part thereof.

                                                                  Page 55 of 59

<PAGE>

IN WITNESS WHEREOF, Landlord and Tenant have executed these presents, the day 
and year first above written.

LANDLORD:  Sobrato Interests,          TENANT:  Affymetrix, Inc.
a California limited Partnership       a California corporation


BY: /s/ John Michael Sobrato           BY: /s/ Stephen P.A. Fodor
    -------------------------------       -------------------------------

ITS: General Partner                   ITS: President
    -------------------------------       -------------------------------

                                                                  Page 56 of 59


<PAGE>



                                     Exhibit "A"
                                      PREMISES





                               Diagram of Building Site






                                                                  Page 57 of 59

<PAGE>

                                                                   EXHIBIT 11.1

                              AFFYMETRIX, INC.
               STATEMENT OF COMPUTATION OF NET LOSS PER SHARE
        (Dollars and shares in thousands, except per share amounts)
                                (Unaudited)

<TABLE>
<CAPTION>


                                                  Three Months Ended        Six Months Ended
                                                       June 30,                June 30,
                                                 ----------------------    ------------------
                                                  1996           1995       1996       1995
                                                 -------        -------    -------    -------
<S>                                              <C>            <C>        <C>        <C>
Net loss.....................................    $ 3,777        $ 2,879    $ 7,698    $ 5,052
                                                 -------        -------    -------    -------
                                                 -------        -------    -------    -------
Historical primary and fully diluted
  number of shares:
    Weighted average common
     shares..................................      6,564            408      3,486        408
    Shares related to SAB Topic
     4D......................................          0          7,403      3,702      7,403
                                                 -------        -------    -------    -------
Shares used in computing net loss
  per share..................................      6,564          7,811      7,188      7,811
                                                 -------        -------    -------    -------
                                                 -------        -------    -------    -------

Net loss per share...........................    $ (0.58)       $ (0.37)   $ (1.07)   $ (0.65)
                                                 -------        -------    -------    -------
                                                 -------        -------    -------    -------

Pro forma number of shares:
    Weighted average common
     shares..................................      6,564            408      3,486        408
    Shares related to SAB Topic
     4D......................................          0          7,403      3,702      7,403
    Convertible preferred shares,
     as if converted.........................     11,336          9,853     10,594      9,852
                                                 -------        -------    -------    -------

Shares used in computing pro
  forma loss per share.......................     17,900         17,664     17,782     17,663
                                                 -------        -------    -------    -------
                                                 -------        -------    -------    -------

Pro forma net loss per share.................    $ (0.21)       $ (0.16)   $ (0.43)   $ (0.29)
                                                 -------        -------    -------    -------
                                                 -------        -------    -------    -------

</TABLE>

                                                                  Page 58 of 59

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM ITEM 1 OF
FORM 10-Q FOR THE PERIOD ENDED JUNE 30, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH 10-Q.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               JUN-30-1996
<CASH>                                          21,309
<SECURITIES>                                    92,533
<RECEIVABLES>                                    1,265
<ALLOWANCES>                                         0
<INVENTORY>                                      1,550
<CURRENT-ASSETS>                               117,309
<PP&E>                                           6,001
<DEPRECIATION>                                 (2,149)
<TOTAL-ASSETS>                                 121,301
<CURRENT-LIABILITIES>                            6,246
<BONDS>                                              0
                                0
                                          0
<COMMON>                                       156,529
<OTHER-SE>                                    (42,325)
<TOTAL-LIABILITY-AND-EQUITY>                   121,301
<SALES>                                            457
<TOTAL-REVENUES>                                 3,715
<CGS>                                              707
<TOTAL-COSTS>                                      707
<OTHER-EXPENSES>                                 8,310
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               1,154
<INCOME-PRETAX>                                (7,698)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (7,698)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (7,698)
<EPS-PRIMARY>                                   (1.07)
<EPS-DILUTED>                                   (1.07)
        

</TABLE>


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